Well ive installed and tried out both, it definately falls into the not as fun as it sounds category. MTA didnt have enough people and the most populated servers had stupid enforced rules like you can shoot these people but not paramedics/firemen, you can earn money and buy a house etc etc, its like second life lol i didnt think there would be much of an overlap with GTA fans and second life people but these servers seem to prove me wrong. As for SAMP had tons of people but they all seemed to be russian, bit of a mess in general tbh, too many crappy roleplay servers and lag and not enough carnage.