I think whenever we buy something, then we are using Bitcoin as currency. But when we're just holding on to them and we leave them untouched, then we use Bitcoin as an investment. My answer to this question is both. I use bitcoin as currency and I also use it as an investment. I have bought some stuffs online using Bitcoin and I'm currently holding on as much bitcoin as I could so that after a year or two, I could get my profits.
Yes its both for all us as if we have an opportunity to spend them then we will surely do, but at a moment there are no wide choices to spend it so majority of us are holding it for future.