Deep sky stacker is very nice to use, Images plus is more fiddly to use. Imagesplus, to me at least, doesn't seem to do any more than DSS in the calibration/stacking area. Images plus is, of course a full fledged image processing program and does much, much more than DSS.
Imagesplus is a favourite program of many people, but you can get results just as good with Iris, which is free.
my 2c
Gary
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