I prefer jam as the preserves have larger and often denser (is that a word?) pieces of strawberries. These larger pieces of berries may often make cutting through the cake a problem and create a big clump in the mouth of the customer. However, having said that, you could certainly mash down all the large clumps if you only have preserves. Hope this helps.
I am in the preserve arena. But I must say that I can my own strawberry preserves, so my strawberries are a little more pureed than most preserves. However, I like the preserve flavor more, and you can always put the jar of preserves in a food processor and puree it more. JMO
Also, Preserves can sit out for hours (12) with no problem. But I suggest you make a batch with your buttercream added and do bit of experimenting with a couple of spoonfuls. Everyone's weather is different, so it may not last as long where you live.
there is so much sugar it should not be a problem left out. If you are really worried, use a buttercream of crisco and use a non-dairy liquid. (ie. Indydebi's)
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