I'd go with Torchic line. Torchic is so cute and Combusken is just pure amazing and Blaziken, just far from impressive level in my opinion plus it's the first and original Fire/Fighting type and design.
Also my signagture Pokemon throughout till now, even in B/W, I still used him. And yet to be my most fav Pokemon and first Pokemon I ever seen and used (Not counting Pikachu).
Chimchar line was okay but didn't stand out much in my opinion while Pokabu line is a complete fail, once again, in my opinion, Didn't stand out much either but worser than Ape.
Didn't really like Emboar anyway.