where I live disc vs rim is no real advantage - it's rarely wet out here. so Rim/Carbon being more finicky, I don;t need.
Carbon vs Alloy - more aero or more bulletproof - I find my alloy work fine, reasonably light for acceleration and climbing.
Tires - good tires in 25 are still my go to on my HED wheels - 19mm internal.
Internal rim width does help with tire compliance vs psi inflation. Many carbon rims are way narrower, internal, than good alloy.
At my weight , 150 lbs/ 68 kg, I ride 75+ frt, 80 psi rear and its mostly comfortable and fast enough for my current riding.
We have plenty of crap roads in Santa Barbara county, where a 32 would seem a nice comfy ride, But a lot more weight to spin up and climb with...
I like 25mms because they're also much lighter... course, I'm still running light tubes also...
tubeless would be nice... iffn I only had 2 bikes - not possible at the moment.... LOL!
Ride On
Yuri