Reduce XT is 7OH DHEA, which is more effective than 7-OXO DHEA for fat loss, cortisol control, and mood support when used orally.
FL7 is topical 7-OXO DHEA, which is regarded as much better than oral 7-OXO DHEA by most people and people generally say they can feel a positive difference more than the can with oral.
So the difference comes down largely to preference between oral or topical. For people that don't have a preference, I would suggest trying both to see which you like better.
I like both, but for me myself, I'm much more consistent with capsules than I am a topical, so I usually would choose Reduce XT.