It depends on the situation, sometimes I use btcs as currency, when I buy things online using it.. And I invest this sometimes, mostly in trading, to make some profit.
That is very right. We should use bitcoin with all of its features. There must be no limit. Bitcoin was designed to have us alternatives in using fiat money with added features - we should use it with all its might. Never limit yourself in using bitcoins because there is a lot of convenience and ease of use with bitcoin compared to ordinary fiat money.