@Wein
the choice what coin to mine is yours only.
the logical choice is to mine what is profitable since the most profitable coin has the best conversion per difficulty rate to bitcoin. and bitcoin is the universally acceptable digital coin which can be used either for online transactions for stores that accept it, or as direct equivalent to cash when traded to bitcoin-local currency exchange sites like
buybitcoins.ph.
there are other reasons to mine a specific type of coin. I prefer to mine doge since for me the pattern of doge price appeared predictable. the price to bitcoin would generally gain in value slowly and explode to mind-numbing heights to maximum, then collapse again to repeat the process. well that was dogecoin a few weeks back before the collapse of MtGox. now doge price to bitcoin has steadily slid down. and it is hard to predict the behavior these days.
while dogecoin was volatile (the exchange value swung from low to high values over the period of a few hours), litecoin on the other hand didn't change in value much aside from the sudden occasional price boosts. that was why I used litecoin as storage coin thinbking the value could appreciate or at least remain stable while I was sleeping or going to work. if I had put my money in bitcoin, that would have guaranteed maximum liquidity but zero gains. I play the exchange a bit more aggressively I guess. but litecoin has also depreciated as well. so that was a wrong move on my part.
prices of cryptocurrency vs bitcoin are unpredictable. that is what makes coin trading profitable and dangerous at the same time. anyone can just mine the coins and exchange them to bitcoins and make a profit but I personally prefer to store my coins in the wallet, wait for the prices to go up, and sell them for bitcoins when the prices are high. then buy coins which are selling low and sell these coins when their value is high also. I do this to maximize profits. it is more labor-intensive because I have to watch price trends but it yields better returns for my mined coins.
I cannot reliable predict what coins will go up in value. so in a sense playing the coin trading game is similar to the stock market or FOREX. I can end up with more or less or zero gains by doing this type of trading and actually lose everything if a particular coin goes bad and no one wants to buy it from me. but this is the exciting part of coin exchange :)
there are numerous coins to mine and exchange. you choose what coin you like to mine or to trade to. that is not dictated by your nationality or location. just to make it less confusing, you can start by mining the most profitable coin, but remember that what is most profitable now doesn't mean it will be the most profitable in the next few hours.