I also have a fairly new 23Gen4, a few months old and can't really complain much about the standard plastic sights. Easy to pick up and tough enough so I'm in no hurry to upgrade. No doubt the two you mentioned are fine choices though.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek