@Clyde thank you for your reply.
And i do unterstand the point that lr-mame of course is much easier to handle with the preset retroarch-configurations.
As i mentioned my first touch with MAME was back in 1997, so i am used to edit Mame by the infamous TAB-Menue, so it is not new to me or even an disadvantage.
In fact i remap the input for a lot of games, using the Shoulder-Buttons for Pinballs or Gear-Shifting in Racing-games and so on, so i dont need the retroarch presets.
Of course i could remap them also per-game in Retroarch but imo this is more complex.
But as you said: everyone has got his favs and so shall it be.
In the end what counts is that MAME is awesome and works great on a Pi. Nethertheless which Version you use 😊
Kind regards!