Before answering to this question there are a number of things that must be clarified.
First of them is that PvP in EVE Online splits in 3 categories : solo PvP, small gang PvP and Fleet PvP.Most of the times, the solo PvP comes down to a pirate disco Battleship or a pirate ship that is 10 times more powerful than his victim ship…like an Ashimu blowing up a Caracal.
Small gang PvP (5-20 ships) is highly different from Fleet PvP (50+ ships) and most of the times, we will have 10 HAC’s or BC’s blowing up 1 or 2 “unlucky” guys .The need of logistic ships in small gang it is almost not needed and while there are EW ships used, those are also almost no needed.
Fleet PvP is mostly encountered in null sec, and the use of logis and EWAR ships is almost a given (outside fun roam of T1 cruisers / frigates).
If there is something common for solo, small gang and Fleet PvP, that must be the use of a buffer tank.Ofc, there are plenty of ships used in solo PvP with success that use active tanking, but what we want here is to find the BEST PvP ship, and most of the times, that ship is buffer tanked.
Outside tanking, anything who is not a logi, or EWAR, or command ship, must have a good DPS.Most of the times, in solo PvP, the DPS is vital, and any pilot who wants to solo PvP will better be sure that his DPS is highest as possible, even if he loses some tank or speed.Same goes for small gang PvP, the DPS is the priority.
In Fleet PvP, most important thing is the buffer.With logis in fleet, it is understandable that the bigger the buffer tank is, the easier for logis to keep your ship repaired and the longer is the time you will dash out DPS.
Another thing that must be taken into consideration is the DPS output.Here, we have 4 types of weapons : hybrid, laser, missile and projectile turrets.Each and every one of them comes in two flavors : short ranged and long ranged.The short ranged ones have bigger dps but lower volley damage.
Solo and small gang PvP fights are taking place in short-range, so most of the ships used are fitted with short range-high damage weapons.In Fleet PvP, most fights are taking place at medium and long-range, so the ship fitting will be long range-high volley weapons.
Another thing that must be taken into consideration is that low-slots are needed for speed, damage and armor tank mods, while med-slots are used for tackling, EWAR, tracking, AB/MWD and shield tanking mods.
The weapons systems, capacitor wise, are split in 2 : the ones who use capacitor (hybrids and lasers) and the ones who does not use (projectile and missiles).While capacitor is usually not of an issue, a ship that uses capacitor to activate weapons it is very vulnerable to neuts.It is vise to use ships that are cap stable for long time, with or without cap boosters.
Last, but not the least, is the price tag, which comes down to fully insurable T1 ships or cheap T2 ships (interceptor, AF).While PvP vets, harshed in many, many fights, with loads of experience know that there is no such thing as best pvp ship, this post adresses to PvP rookies, and it while EFT is not a measure of success in PvP, but skills and experience, I have to use it to at least answer to the questions in the title.
So, while I know that 80% of you will hate the answer, but will most likely have to agree with :D , the answer to the tile questions are :
1.There is NO best PvP ship in EVE Online.
2.The best suitable PvP ship is the Drake.
First answer is well knows by the PvP veterans.The second answer is for rookies.The biggest advantage of the Drake in PvP is that in this ship, you can actually GAIN PvP experience, simply because his buffer tank is high enough to give you time to see what is happening and not be blown in 30 sec without even understand what the hell is going on.
Another reason that the Drake is most suitable PvP ship, is the fact the being a missile boat, you don’t have to worry about tracking issues AND capacitor issues.Missiles don’t need capacitor to be active.
The third reason is that the Drake can change missiles damage type WITHOUT losing much DPS, range or capacitor use modifier.
The fourth reason is that the Drake can fit MAX dps without sacrificing tank, do to the fact that he uses mid-slots for tank, while other BC’s use lows for both damage and armor tank mods.The Cane, the Myrm and the Harbi all have 6 low-slots and using 3 of them for max damage leaves room for only 3 armor tank mods, while the Drake, with 6 mid-lots, can fit 4 shield tanking mods (will use 2 mids for MWD and Disruptor/Scram).
The fifth reason is that the Drake is the best choice for shield Fleet PvP, while other BC’s are not really fit for armor Fleet PvP (they lose against AHAC’s and armored BS).
Even in terms of solo PvP, while not first choice(the Cane is known as first BC to be chosen for solo PvP), it is almost as reliable as other BC’s, being less powerful in DPS (but not much less) and more poerful in tanking.
All in all, the Drake is the best SUITABLE PvP ship out there.
Just remember, there is NO BEST PvP ship in EVE Online.All comes down to skills, experience, ISK and what kind of PvP you like and are good at.