Stock rings on a 2.6 are chrome and seem to hold up quite well.

Good info on rings materials

I have been running chrome rings on my turbo 2.6 engines for a long time with no issues.

Moly is a good choice as well, with better scuff resistance, but is not as good off road in a dusty environment.

With good block prep, either will give good service. The best tip for good oil control and compression is to make sure the ring gap on the second ring is wider than the gap on the top ring. This assumes that the top ring has the correct minimum gap.

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...