The Supercar 3R is faster but it's harder to get times out of versus the Re71RS. The Re71RS is closer to max grip from the ou tlap, gets there quickly and doesn't fall off dramatically. The 3R can be outright kinda dangerous on the out lap if it's cold, or damp, all the way to hoosier levels of grip, so as a driver I find it harder to get comfortable/confident with it.
Yeah, there have been some magic sessions on them, but I couldn't figure them out this day. They were pushing SO much more than my RE71RS. Half inch smaller wheel and 10mm less on the tread width compared to the RE71's, might explain a bit of it - but I was struggling in 1 and 8-10 on the RE71's.