Omisego is a good altcoin to invest I think the price of OMG is too low now but lot of altcoins has started to pump if you want to invest in OMG this is the good time to buy you can hold OMG in lot of Wallets but my opinion trust wallet and safepal wallet these to wallets are free online mobile wallets.
Safepal is usable to keep our OMG coin.
If we used android and prefer use handphone, I think safepal is the choice.
Sometimes I also used trust wallet, it is safe.
But I think metamask is also good , it depends on what you want to do.
PC or android.