When using braid (always pp) I go by similar diameter and tend to ignore the breaking strains. I only have braid on one Barbel reel and it's 30lb (there I go ignoring the b/s)
similar dia to 8lb mono, the lightest I would consider in any situatiion.
My pike rods are 50lb (boat) and 65lb (bank), similar dias to 12lb-15lb-17lb mono (manufactures vary), 15lb mono being my standard go to when I used it.
I was given this advice when I first started using braid and it makes sense to me. Why go light in the b/s just because you can? more abrasion resistance, being able to get fish out quickly, having the confidence in your tackle to hit and hold away from snags, it's a no brainer for me.
I've never heard of the super slick! Probably because I'm happy enough with PP and never looked for an alternative. I was going to ask what's the actual difference between it and normal power pro? but a quick google came up with this;
https://www.youtube.com/watch?v=olPJkxslD5E
I was expecting a lower diameter for the given b/s but that's not the case. I find normal power pro to be very supple once "worked" in. If this stuff is that much "limper" it might be worth a look!
EDIT!!
Just read this through, it wasn't a direct response to anyone or their opinions, it was a general observation on my views about braid applied on the waters that I fish. Talking to the bloke in the pub is easier