Ask Twilight and Rainbow Dash to choose. The one who’s more eager (or at least less opposed, or more willing to take one for the team) and I snuggle.
I expect it would be Twilight, though. EqG made it canon that she’d get snuggly with humans. On the other hoof, Rainbow Dash is known to get competitive, and she may not want to let someone else win the Ferrotter.
Hmmm… such a choice is to be made by a true connoisseur of fine pony snuggles. Thankfully I am here to save the day.
My plan would be to invite the ponies into a pile, a… cuddle puddle, if you will. Keep in mind I will arrange them to my most preferred personal choice, but my plan is purely interchangeable to suit your own preference of ponies so you may feel free to swap pony positions. Applejack would be my chosen snugglee and me and her would lay together, with my arms around her and gently massaging her weary work-worn muscles and her head comfortably resting on my shoulder. Spike, being of a small size to comfortably allow this, would lay curled upon my belly. The remaining ponies would lay cuddled beside me in various positions: Pinkie Pie laying on her back behind me with her soft warm belly serving as a pillow, Twilight to my back with her wing draped over my shoulder to keep me warm, Fluttershy and Rainbow Dash together laying across my legs, and Rarity filling what little space was left with her head across my chest to be close to Spike.
As I am only actively snuggling one pony, my choice being Applejack, this is still allowable within the rules of this image. Also the princesses and Big Macintosh are invited too.