I have been here a short time so take what I say with a grain of salt. I have also looked around because I too am often checking to see if the grass is greener.

1. I initially bought into the Koolaid, but I have come back to reality a bit on that. Dont get me wrong, the training department does their job very well in regards to this and you certainly feel like you have just found the perfect home. While the reality of this often comes to an end fairly quickly once out on the line, it really doesn't change that the people you work with on the line generally are awesome. Fun crews to fly with for sure.
2. Having a 3on 4off line my second month here with 17 days off and only 8 nights away from home was amazing, especially compared to the places I had come from. Nothing against them, just it is nice to have all those extra days off. However, you pay for those days off with high workload trips. I am genuinely tired after a day here, especially if you get one with 4 turns in California or something. It's busy but efficient.
3. I feel way to much emphasis is put on the 737. Sure it's old and not as comfy as the 320, but it is fun to fly and is a workhorse. As someone that has flown E175/A320 and now the 737, I find they all suck at the end of a long day. Would it be cool to fly a WB, sure thing, is it cool enough to give up all the other benefits I get, I dont think I am there yet.
4. AM/PM schedules and general flexibility with your schedule is great. I hate PM flying and will take an early wake up anyway, however for those that like it the other way, that option exists. Being able to move your trips around assuming you can properly manage ELLITT and all of our other options is also a big bonus.
5. Our Regular plan for insurance is second to none in my opinion and as far as I know, we are the only ones that have it. It costs $0, has a $250 deductible and then goes to 80/20. If you ever hit $2500 in a year as a family it starts paying at 100%. Its has some quirks to work around and I dont think its great for people wanting kids, but once that part of your life is over it essentially saves be $6000 a year in paycheck deductions.

Just some ramblings off the top of my head, hope it helps. I am happy here for the most part, but like any airline the management sucks and there are things that I would love to change, but that's ever shop. Good luck to you either way.

PS. Just doing an edit for prosperity, but I live in base, have a short drive and my kids are all in college at this point, so my experience may be different than someone else's.