It is best to use Coibase *only use Coinbase pro if you know what to do* you may end up paying more fees (market order) which is one of the things that made me lose a lot when I wanted to sell (more than 20 dollars)

If you want to buy Bitcoin for one time and do not want to buy again, use Coinbase.
If you know to trade and know what you do, use Coinbase pro.