I have a few of each, two female B. emilia and 5 G. pulchra. None are adults, but I have kept adults of both species.
I actually prefer recommending B. emilia over G. pulchra for a first time Tarantula owner.
G. pulchra grow EXTREMELY slow. They are stunning adults though. While B. emilia have a pretty decent growth rate.
B. emilia are one of the best feeders I've ever seen. They'll take anything you give them and then some. G.pulchra also have a rather healthy appetite as well.
Both species are relatively docile and neither show much aggression. I've had a few pulchra throw up a threat display, but I didn't take it serious. Besides, you don't have much to worry about with New World Tarantula's and their venom.
In the end, either choice is an excellent one!
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