It's really up to what you want to use each for. Considering that you're probably talking about fiat, I would say that if you want to use something more as a currency, use fiat. It's accepted much more across multiple platforms; it's what the sellers normally expect you to use to pay. If you're looking to get a form of payment that ranges in the evaluation and one that works as an asset/investment as well, work with bitcoin. You'll have gains in the future and be able to use it then.