i have spend time on these 2 forums, and i think there are many differences now between these 2.
ALTtalks is easier to rank up than BTCtalks, its so much better for newbies... so i think in the long run, ALTtalks can do better. its really not easy to get merits. + i have to pay to be a copper member in BTCtalks, what kind of rule is that? and copper member still have many restrictions too... i paid and still get restrictions?? its really not fair for us.
however, this does not mean i hate BTCtalk, i still love both forums 
Well that's is your choice, as well as mine I prefer ALTT also,
BCT just became more toxic, members are pointing out each other's mistakes for their own interest of getting merits, being unreasonable critics for beginners / newbies, A lot of straw people are there. Sometimes I felt out placed being there because they have such a high standards to meet for each of other, which I can't take.Tho, in BCT there is more informations to be absorbed yet, I still choose ALTT because I prefer newbie friendly than critics lol.