If you have the money, then the Siglent SDS1104X-E for 500€. For beginners (and everyone else) it is a nice scope with a lot of useful features for a fair price.
Just the bandwidth is limited. If you want to measure high frequency signals, it would be the wrong scope.
There is already a very long thread for this scope in this forum with all necessary and way more information. You will also find a lot of youtube videos about this model. It is very popular.
If it is too expensive, I would recommend the Rigol DS1054Z for 400€. But if you have the additional 100€ it would be worth to buy the Siglent scope.