Hi GuybrushJo, arrived home 2am this morn (6 May) so didn't see your query until just now after getting up bleary eyed but sick of being in bed (too many reviews to write LOL).
Of Perhentian's and Redang I would have to say the Laguna Resort at Redang would be the most luxurious of what I saw (I didn't see inside any rooms so I am only going on lobby, restaurants, cocktail bar area, pool area and grounds). It seemed very nice and the staff there were very friendly and helpful when we dined there or had cocktails watching the live band. Is on a beautifully clean, azure blue, clear water beach.
At Perhentian's we stayed at Coral View Island Resort on Besar in their Family Deluxe beachfront chalets (and friends stayed in beachfront Deluxe Chalets). Only difference was ours was a little larger with a single bed and bit more room plus bigger bathroom. Theirs was on the 'sunset' side of the point with slightly better view but both close to facilities. Deluxe it isn't but clean and tidy with all necessities they are (have good working air con, good working fan, mini fridge etc) and are cleaned daily. We would stay again in a heartbeat.
The most luxurious looking place we saw on Perhentian's was probably BuBu's on Kecil. We didn't think Tuna Bay looked any better than Coral View (in fact for ambience we were really happy we chose Coral View).
I will post more info in a JBR but you will need to give me a couple of days to get it typed up and posted.
Any other specific questions feel free to write here and I'll keep an eye on this thread and reply.
I saw babies at both islands and nobody seemed to be having an issue so I think either would be fine but Redang a little more upmarket overall and you have the ability to fly directly in and out with Berjaya for okay prices versus the more indirect, slightly more hassle of getting to the Perhentians. Maybe this is a consideration with a young one for you (?). With no kids and no mobility issues we would go back to Perhentians before Redang (but only because the diving and snorkeling were better and it was a more relaxed vibe which we were looking for). For nightlife definitely Redang though.
Edited: 8:55 pm, May 05, 2013