Most of my Beyblades are from Hasbro, but I've been buying a lot from Takara and Sonokong recently since the mall doesn't always have everything. I find that Takara is generally the better company (Sonokong Beyblades being of equal quality to Takara). Hasbro butchers everything - the names, the face bolt designs (though some of the recolor versions are nice, like Gemios), and even the paint on some parts. Did you see the ugly color on Hasbro's "Hades" Fusion Wheel? I've also never had a Takara part break on me, whereas my Hasbro parts get busted, like my ED145 and almost every HF tip I've bought with the exception of one.
I must pay Hasbro its dues though, those Tornado Battlers are pretty darn interesting to watch, if uncustomizable.
Both companies are seriously flawed in the way they rate the stats of parts, though. They should test everything before they release it.
Beyblade is my favorite hobby. There's just something about it...