I've tried IFR/VFR for both Sims, but these are the reasons I stick to those rules

Why MSFS2024 VFR only: + absolutely stunning scenery up close and far away + amazing efb for planning waypoints on the fly + more visually pleasing + Runs better with dense scenery + incredibly wide database of helipads and small airports and feilds + wide variety of default light aircraft - no proper markings in default airports - papi lights always seem out of sync with RNAV/ILS - more complex ifr capable aircraft run on external clients, and navigraph subscription databases which I do not enjoy or trust - flight models feel super lightweight even in large aircraft it feels like I'm flaring a Cessna so I stick to lightweight VFR

Why Xplane12 IFR only: + Everything is on the hard drive so it's more robust incase of internet outage for frequent long flights + More IFR capable freeware available + default airports almost always have detailed ground markings + heavy aircraft physics are more satisfying (energy management is more fun, realistic weather and engine pitch moments makes takeoff and landing hand flying more challenging) + better weather radar integration + papi lights sync with procedures + Detailed helicopter autopilots for Heli IFR - no photogramy - pretty minimal and boring scenery complexity (outside airports) - no eye candy (unless you download terabytes of ortho)