No need for further debate, it's both. If the owner of the bitcoin wants to hold it for investment purposes and he sees it as an asset, why stop him doing so? and if someone uses it for transactions like what we usually do, then it has to be done for that purpose.

Like what it's made being as a decentralized cryptocurrency. No one can dictate you which use you want to spend it for. Use it as both if you're completely doing both or just any of those.

Depends on the owner.