My choice is Leopard 2A6 by Tamiya with PE parts and barrel by Voyager and Ace Spade Models tracks - 2 pin version with microscopic size parts.
Voyager's set is a masterpiece. Insane turned barrel, some resin parts, and PE with different thickness (side covers most thick).

Tamiya means that model fits like glove (almost). I attached rear plate - in few places minimal putty will be required.
Of course I wouldn't be myself without adding some features. Firstly I drilled out exhaust ducts, added tubes behind to give some depth.
Before:

After:


Dryfitted top cover shown clearly next feature to be added. In box version circular covers of the cooling system inlet are closed at the bottom. Voyager's parts are very fine nets and all below would be visible. I have to add imitation of the fans in the inlet - two pieces.

It will look as follows:


Cooling system under construction.
Circles cut out from 1mm styrene with Olfa cutting compass. Edges sanded out. Glued. Few Surfacer 500 coats applied to create smooth transition. Now (tomorrow after drying) all will be treated with 3M sponge in the background (finger in the middle and sand sand...). In the middle hole place for fan blades.
