I used Kraken when I started in crypto, but after numerous errors and login failures I now use Binance, which works great and has cheap fees!! Like a comment on bitcoin.com said today, new guys like Binance will take over bussiness from the older ones ,as the old ones can't handle the growth in crypto world...
If the old ones can't handle the growth in the crypto world the small ones won't be able too. At the beginning yes as the sites are like a ghost, but once the site has a decent member base and keeps growing the problems start. And here is the difference, the big sites have funds and resources to grow while the small ones don't have