I see Bears has very exclusive taste, disregarding everything but the 10th (Tennant). Eccleston (9th) seems vastly underrated imo, and Smith (11th) can't compare to either, but he still isn't bad per se. I was hooked from the first episode ("Rose", season 1 with Eccleston), but then again it was the same with Friendship is Magic, so maybe I'm just weird. I think starting from the same point I did would make the most sense, but if you don't like Eccleston's performance (cretin!) I suppose skipping to Tennant (the exact point of his appearance I will not disclose unless you really want that because spoilers) could work too. And if you don't like Tennant there is no saving you anyway.