I've tried both. I used udg on top of both. B'leave in gave more curl formation. Foam gave more volume ...however, if you put it near roots it'll weigh you down, so the volume is more fluffy-ish (not frizz, but like bounce) but not root volume. I'm actually planning to use them together tomorrow to see what happens.

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Modified CG since Dec 2011
Growing out super short cut

High porosity, fine, unknown curl type, somewhere in the 2s at the moment
Mostly low poo
Current rotation includes:
Wash: Yes To Carrots -Condition: Yes to Cucumber, Nature's Gate Jojoba, One C - Stylers: Deva volumizing foam, Deva UDG B'Leave In, Foxy Curls Hi-Def Curl spray