The Tiger I was a hurried development due to meeting superior armour on the British and French tanks in 1940, it suffered as a result. It was costly in time and materials to produce and was very difficult to transport. It was virtually impossible to recover as there was no vehicle that could tow it. Two or three standard heavy recovery vehicles were required or another Tiger I which invariably caused its engine or transmission to fail were required.
It had a long range gun but suffered in close in fighting (terribly slow turret traverse) the same as the Panther as they were at their best in long range engagements. The tiger II was just a total waste of design and construction resources.
The Panther was hurried into production without all faults being rectified, the Panther D was unreliable as issued with most originally lost through breakdowns, by the time the Ausf A came around the problems were mostly sorted. Of course then they took a backward step with the Ausf G which although reliable lacked many features of the Ausf D making them less effective. Of course they did the same to the Panzer IV to simplify construction and reduce costs/strategic materials.
As for the original list here on the best tank I am afraid that none would be my vote.
Panther Ausf G the final variant was a retrograde step of the Panther Ausf A. Worse than early Shermans for Brewing up due to rounds placement.
T34/85 by the time it was introduced it was a desperate attempt to catch up with German Armour, it became equivalent to the then current Pzkpfw IV, much better to have put the resources into the T44 instead of delaying it.
Sherman M4A1 ended up being too long in the tooth and way past its best, good for indirect fire although its HE shell was worse than the 75mm armed ones. AT penetration was better but it was never issued with decent AT rounds which went to the TD battalions.
Tiger I big scarey gun on a heavily armoured chassis, unfortunately it was prone to engine and transmission problems, slow turret traverse, limited mobility. Thought to be impervious to nearly all allied AT weapons but in first combat with the British three were lost, two to towed 6 pdr and one to 6 pdr Churchill tank.
And now for some of the rest
Sheman Firefly, good AT gun in a reliable vehicle, good fire control and turret system but let down by thin armour and lack of main gun depression, HE ability reasonable. Rough ground ability not so good, high profile.
Comet, good gun almost equivalent to the 17pdr, fast, reliable, low profile, good cross country ability, no upgrade path. Too little too late to prove itself.
IS2, good gun but slow to reload and limited rounds carried, armour variable due to indifferent quality control at times.
M26 Pershing, good gun and armour, reliability issues with the engine and transmission.
Churchill, Good armour and crew survivability, reliable, good rough ground and climbing ability, poor AT gun with 75mm but good HE, 6pdr good AT but out classed. Chassis excellent for adaptability. Infantry support tank only no pretence at being built to take on other tanks.
Panzer IV ausf G, probably the best version, later ones had some serious retrograde steps. Fairly good all round medium tank just at the start of the chassis being overloaded. Replacement design due really (Thats what the Panther was to be).