There are tradeoffs you have to accept. Coinbase used to be great- super user friendly and reliable, and most importantly, FAST. Buying anything from Coinbase now is a joke, and they have repeatedly committed fundamentally unacceptable actions for a company dealing with money and related analogues like, after a transaction was supposed to settle, push out the date that you'll receive your assets.

Unfortunately they are the best when it comes to quickly cashing out, and in terms of buying I have no other alternative that I've used thats reliable. Depending on the asset you might have some luck with Cex.io or others.

Here's a link I found with a quick Google search that might be of value to you: https://99bitcoins.com/buy-bitcoins-debit-card/

Don't ever hold your assets on an exchange for any length of time after acquiring them, counterparty credit risk is no joke.