I've built all three (Tamiya, Tasca and Dragon) - at least up to the painting stage.
The Tamiya is by far the easiest build - I built their Early Production and getting it to paint stage was literally a matter of a single night at the bench. If you're not familiar with armor kits, it's the one I always recommend as a great entry point. Problem is that Tamiya doesn't do all variants.
The Dragon mostly builds well, but you need to be very careful with the instructions. Mine mislabeled the idler mounts so they went on backward and basically ruined the build. Also, the front transmission housing/drive sprocket mount assembly on the welded variants is a super PITA. It looks much better on those with cast housings.
The Tasca kits are amazing. Think Dragon's love of tiny parts and detail with Tamiya's engineering thoughtfulness. Things fit and fit well. The .50 cal Browning is a work of art. The jerry cans are molded in such a way that you aren't gluing halves together, but gluing the bottom in to a completed can. The only thing I don't like about them is that, for a kit of their size and detail, I expect more than bisected barrels...I mean it should at least be a slide-molded single barrel, but there are aftermarket metal barrels aplenty.
On the Bench: 1/32 Trumpeter P-47 | 1/32 Hasegawa Bf 109G | 1/144 Eduard MiG-21MF x2
On Deck: 1/350 HMS Dreadnought
Blog/Completed Builds: doogsmodels.com