Which is the best altcoin to invest upon in current month of Feb and upcoming month of March? 
I think there are a lot of altcoin in the market, they all look very profitable.
As long as we hold the top 5 COINS for a long time, it's profitable.
You can go with big altcoins,like ETH.You will get good profit from it,considering that market is raising again.
Also,make sure to check new coins,which brings new,promising projects.
REMME coin,for example.I like the idea of its project: bringing new way of authorization.This coin could raise in prise at anytime.