it depends what ytou are using them for.
my experience is this,solo step dancing slow ,dotted about 2 and a quarter, 2 and half to one .
nottingham swing 2 and a half to one.
fast irish hoppies[keel row seems ideal].2 to one.
most of the classic hornpipes for dances like stack of barley,have a stamp to them[one two three]often at the end of a phrase.
Scottish players[in my experience][[I used to play regularly for Burns nights and scottish societies]] tend to swing them a bit more,and I think thats great for dancing,they are very particular about their dottedness are the Scots, their strathspeys often have reversed dottedness,and are heavily dotted.