I'd think it would depend primarily on the rig. I'm rigged with forestay's, babystays, side shrouds, check stays and a adjustable backstay on a double spreader rig, with 320 sq ft of high roach main, and 340sq ft of roller jib and a 400+ ft screacher. I'd guess a 7/8 fractional rig.
The designer of my boat (Gemini 105mc) specifically states that if sailing with just one sail, use the main. Having said that, I roll out the screacher when I'm single handing because I'm lazy - but only if the wind is below 10knts.
I've noticed that Jib only in a puff generates a touch lee helm, not a good thing but manageable so far.
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