I have an Xbox One S and I only play 3 games but I find it expensive only for 3 games to pay 60 euro online I should just sell them and buy a nitendo switch. Or are there any cool games for the Xbox?
There are a lot of good games. Degree older titles are cheaper and often on sale.
There are also a lot of good games for the switch. But keep in mind that the games are much longer expensive and rarely fall in price.
It depends on what kind of games you have fun with. XBox and Nintendo both appeal to other consumers. Here is more the question of which camp you like more. Microsoft or Nintendo.
These 60 euro are for a whole year. That's not how much money it is now. Nintendo wants to see coal from you as well, if you use their online services. At that point, I would not commit my decision.
Look at the games of both consoles and decide on the games, which is more to you.
Would be a pity if you sell the XBox and rob the switch because it does not offer matching games for you.