A year or 2 ago I got the x2 Power SLI 27AGMDPM for my Jeep, because I had been using an OEM spec battery, which wasn't really enough for the R2.8 and it's been good so far. I don't love dual purpose batteries, but it was the only single battery that Batteries Plus had that would have worked. Of course if you have AC it wouldn't fit unless you changed the orientation. For me it came down to price and simplicity. I could get 1 battery for under $400 or 2 smaller batteries for about $600 and then I'd have to stack them and mess with their orientation. I did have to make a little room inside the engine bay for the single battery, but it was very easy.
As far as posts, I do have the posts and I utilize them, but I suggest swapping to the military battery terminals and then you'll have a lot of real estate to work with and also if you're running lights and accessories, either figure out how to get into the OEM box or just add another box to keep all your relays and fuses in and then run a single line to your battery. Winch is obviously going straight to the battery. I've got an Aux battery too and it goes directly to the battery so I do have a bunch of stuff going there and yes the additional post are really handy, even with the military terminals.
I've been accumulating old diesel powered equipment and I'm a huge proponent on having more than enough battery to assist in starting and my ideal setup would be 2 high quality starting batteries and they would also be great for winching or any other high draw function too. However for most Jeeps and winching 2 dual purpose batteries are more than capable of handling that load too and with 2 batteries the winching load isn't that large. Things get tricky and IMO expensive when you try and start a dozer with the battery the size of a AA. My dad is always trying to use the smallest batteries to start equipment and then he ends up ruining that battery in months, rather than getting the right batteries and maintaining them. You can usually pro rate those batteries, but I don't really need to waste most of a day doing the exchange and having to pack around and pull and install batteries and lose that time working.
I'm not really brand picky because most of my batteries aren't really space limited so I just get relatively cheap group 31 batteries and they seem to last if maintained and I try to make sure my wiring and terminals are good and I disconnect the battery each day as well. If you are going to let your batteries sit, go ahead and make accommodations to maintain those batteries too. Also those NOCO jump starters are amazing.
