Bro! The whole point of btc is that you can do both at the same time!
BTC inflation makes it so that saving btc is the same as investing in it!
True, my biggest stash of coins are safe on hardware wallet, I dont use them for trading or anything. So you can say its saving with potential of growing to be really nice investment. My biggest problem and worry is what price will be my exit point, I still havent decided yet.