
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

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If packing space, weight, and cost are all no issue - then the Exped Megamat is the top choice for comfort and warmth. For me, it was too big to pack so I opted for the Big Agnes Campmeister deluxe XLW (extra long and wide) - packs down tiny, really comfortable, and insane thermal value I think R value 7
Get something with 4 inchs of thickness. Us big guys need that level or near to it of thickness. Nemo Quasar is close, same with Big Agnes Campmeister. I have the Thermarest neoloft and love it. I'm also a big guy. Thermarest and definitely the Campmeister are good for those temps.
Big Agnes campmeister deluxe. R7 value 3.5 inches thick. Their long extra wide is 30” wide by 78” long. It’s magic.
Big Agnes Campmeister or the Exped Megamat Ultra. Both are comfy and you can really spread out. Neither is light, but both are worth taking for good sleep.
The campmeister has zero support in the center unless it's inflated super tight. I returned it after one trip. The Exped Megamat Ultra has been warm for me down to 20F/-7C. I haven't tested it below that. It's much more comfortable than the campmeister too.
We have the same sleeping bag! We use the Big Agnes inflatable, we probably have the same mats but I don’t like them. I sleep really close to my spouse and I end up getting stuck in the little gap between the two mats every time. Part of the problem is that I’m a side sleeper and a creeper, so I just scoot closer and closer to steal heat. I thought a 2 person mat would help keep me from getting stuck in the gap between the mats but I’m open to suggestions.
I know what you mean. Being in the gap seemed like the best way to describe it because it’s kind of hard to explain. It’s more like I’m on the very edge of the mat. My shoulder and hip are on the edge of the mat because we spoons so its 2 people mostly on 1 mat, the other mat kind of pops up a bit because I’m only on the edge of it and throughout the night it gets worse. My spouse doesn’t have any problem with the mats but they never end up in the bad spot. I’m sure a lot of my problem is because I’m a side sleeper. So I was kind of hoping for something with a little more support than the BA double sleeping pad. Unless, have you tried it? Is it more supportive than their regular pads? I thought they were the same.
So sorry for the confusion. When I car camp I sleep on a foam bedroll, when I backpack I sleep on an inflatable pad. I have a double Big Agnes sleeping bag but I don’t like the sleeping pad set up it has. It’s a 2 person bag and you use 2 sleeping pads. I sleep on my side and I cuddle close to my spouse so and I’m kind of like on the spot where the 2 mats meet. It’s uncomfortable. I’m comfortable spending a bit of money on a good pad but I don’t want to spent a lot of money on something without a recommendation, if that makes sense. I would like to stay under $500, USD from what I’ve been looking at, the double pads are kind of expensive. I am a god damn baby and I won’t go if it’s below 30F. It’s too cold. M/F couple, we’re thin, both 5’10”. Honestly I can see the appeal to the separate sleep situation and this is the first time I’ve ever slept in the same sleeping bag as someone but the two person bag is warmer.

Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Exped
Ultra Series
Lightweight side-sleeper comfort, but a bit pricey and bulky.

NEMO
Tensor Series
Ultralight side-sleeper comfort, but slippery and prone to leaks.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with side rails, but heavy and warmth claims disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable, good service, but heavy and bulky for backpacking.

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Therm-a-Rest - NeoAir Xtherm Series