I've used 1&1 for over a decade here in the U.S. It's inexpensive, reliable, and offers a very complete range of supporting software. It can be a bit confusing for a beginner to navigate, but that's true of most competitors. I don't know that my website has ever been unavailable. Email access is unavailable maybe once a year. Overall, an excellent record for uptime.
I have various sites with Ionos and manage a few sites for others, some of which are with GoDaddy. I use a central management system for monitoring them and am constantly getting notifications from the GD sites that they are down, and not just for a couple of seconds. I have never had a downtime notification from Ionos during UK day time, occasionally overnight and with pre-warning. Customer service has been great, although I would prefer live chat.
The list of countries includes all countries of the world, including all those in our area, with the exception of Croatia (Local name CHrvatska). Why?? Can this be corrected ..I cannot claim a member because I am unable to register my country.