I have been thru that decision process myself - maybe flip a coin - "only you can make the call" :>) Base it on what you will use it mostly for. If I was not concerned about weight/size I'd go full size.
I went with the Jarbridge 1st, then saved up for a full length. I choose the one most appropriate for each trip (and the Jarbridge always wins). In Cold weather I stack the two. Also, I now have a spare for guest (= grandkids).
An option to consider, get the 3 season Jarbridge (regular/sale $100/$75 and 20 oz from AHE) and a SnugPak Under blanket (regular/sale $50/$45 and 45 oz from Barre Army/Navy Store). Get what you need now and watch for a sale on the other. Watch HF 'for sale' area for used equipment.
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