Well I've got an adaptor to plonk car seat onto buggy frame which I have used a sum total of never in the past year so I don't think you necessarily need to be able to transfer.
Buggy shopping nearly gave me a stroke so I ended up asking experienced friend who just said "baby jogger".
I went for the city mini GT and haven't regretted it for a second. It lies flat so no need for carrycot (though you can get one if you really want). I stuck a mamas and papas newborn inset in it for when DD was teeny and got rid of it when she started wanting to sit up and look around. I use a wallaboo footmuff in it for cold weather (had to cut a few extra slots for straps but no biggie).
It's a three wheeler with a one handed fold (I lurve the one handed fold). I could hold DD, fold buggy and chuck it in boot one-handedly few weeks after C-section so I was impressed.
Forever air tyres so good on all surfaces and won't puncture. I'm semi-rural and have used it in town, on gravel, on forest paths and through the odd reasonably smooth field and it's been great.
Lovely basket underneath that I can fit a good wee shop in and a hood that comes down far enough to often not even need to use raincover.
Downside is you can't make it parent facing (can peek in the roof windows at her though) and it doesn't have the "look" of a traditional teeny baby pram but I got over that. I also found it didn't sit as bolt-upright as I'd have liked now DD is older but I got some little clippy straps on eBay recently that sorted that out perfectly and DD can now snoop to her hearts content.
Got maxi-cosi car seat with adapters for it too (never used as mentioned).
Buggy shopping is HELL. So stressful. I was just delighted to have someone tell me what to get so I could close the zillion open tabs on my internet browser and stop trying to weigh up different randomers' opinions online.
But then again this is just another randomer's opinion for you! Hope it helps though!