First question that you need to answer is what are you trying to mine, If you want to mine bitcoin
ASIC miners are the one that can mine bitcoin but if opt to mine altcoins then you can go with GPU for mining.

GPU mining can be profitable in mining alt coins and it can also do multiple mining wherein you can mine 2
different alt coin at the same time unlike with ASIC miners most of the devices are specifically built for a coin.
And another advantage that GPU has is that it has longer warranty period and once mining is not that profitable
anymore you could use your device as a GPU for your computer just make sure that the GPU that you get has a
video output on it since manufacturers are now releasing GPU for the sole purpose of mining.