want to jump to 60V and then you could go any platform, probably EGO or Greenworks but replacement batteries are expensive. 20v will allow you to use your existing batteries but run times will be 1/3 lower (10min vs 15min), a little less performance as well.

I'd look up the Dewalt yard tools in 20 and 60v, compare prices and then watch some YouTube videos on blower and other yard tool comparisons to see if they perform well. Then decide if you want to do 20v or move to 60v platform. Also consider if you will be buying other items like trimmers, mowers, other available power tools. Most go 60v for a reason but it also depends on your yard size.