If you read this blog with any regularity, you know that I am very entrenched in the older ruelsets of D&D, their clones and derivatives. There are many reasons for this, but probably the main one beyond nostalgia is "comfort zone". I can pull out a classic D&D derivative and find my feet well situated on familiar ground.
In my early days of playing, especially the high school and early college years, I was much more of a "system vagabond". Sure, AD&D 1e and 2e were my familiar homes, but it was not surprising to se me run a campaign of WFRP, MERPS, Spacemaster, Paranoia, Runequest 2 or even dabble in a dozen other systems for a session or three.
It seems with middle age, my ability to learn significantly new system mechanics has declined. I thinkthat has more to do with free time to learn such mechanics than a lessened desire to do so, but for me, the results are the same. The DCC RPG is about as far from core OSR as I am willing and able to stray these days, and even that required defaulting to 1e rules when in doubt.
If you are mostly an OSR gamer, what non-OSR games do you dabble in (if there is one)? If you are mostly a non-OSR gamer, what is your "go to" system and why?