They both have similar yields and annual expense ratios. Both are populated with small cap holdings but DGS has a slightly deeper value tilt.
With a decent dividend, one can wait out long down-cycles like occurred from 2014 thru the beginning of 2016. That opportunity to get to 100% invested helped average cost/share and gave AIM a chance to catch up with Buy/Hold and actually exceed it slightly.
There's not been a lot of frequency of price direction change but the overall amplitude has been good for trading around the core holding.