Hi A.M. ;

  I guess it would be three of them .The Sturmgeshutz- Iv and then the Patton M48- A-1 followed by the Abrams A-1 .

The good old M4 Sherman, wasn't the biggest or best but it kept going in any conditions. And it contributed largely to winning the Second World War and Korea and was used right up into the '80s (maybe latter). 

And a lot of recent debunking of it being some sort of death trap by people like Steven Zaloga has been coming out recently. 

Though if you mean AFVs in general I might have to go with the M18 Hellcat- it's just a sexy AFV! 

For some reason I just love the brute-strength look of the Leopard 2A4 with its big, boxy turret. But the Jagdpanther is also a pretty sweet ride...I'm also partial to that big lummox, the Jagdtiger. That was the tank that first impressed me so when I saw it at Aberdeen in the mid-80s, and I said "I gotta have one of those...in model form, natch..."!

I've always been partial to Russian T-34's.

Tiger.........anytime, anywhere, always................period!

Panther G Late with the chin mantlet.

Sherman,cast hull

M1 Abrams...it has the looks and can back em up :P

Close second would be the M4A3E8...love that old war horse

The most beautiful tank (if such a thing can ever truly exist) ever made:

German WW2 Jagdpanther.

I have a soft spot for most US made tanks... But tops would have to be the most successful and butt kicking tank of US origin... the M1 Abrams...

Guess I just like the older stuff. My favorite is the U.S. T26E3 (M26)