I had an Astral rescue vest that was stolen last year & replaced it with the Ronin Pro. I liked the Astral but I think I like the Ronin better. The front entry is easier to get on & off. At first I wasn't crazy about having to re-do the release harness every time I put it on but I've changed my mind about that. It only takes a few seconds & I think it's a good idea to re-do it just to give you some peace of mind to know it works & is threaded correctly.
One thing to be aware of is the sizing. I have a 40" chest & with layers & drytop on, it's probably 42" which is the upper limit of the small/medium. I'm a proponent of having the smallest size you can fit into so, when you cinch in down tight, you won't have a lot extra strapage flailing around. I got the S/M but if I gain any weight, it may not fit anymore. If, like me, you fall in between sizes, you might want to try them both on to which you like best. I wasn't able to do that.
Overall, they're both great PFDs. I'd get the one that fit's the best and/or has the entry system you like best.