For me the biggest upgrades (coming from the series 5) are the noticeably larger screen (actually only 1mm but combined with the flatter screen makes a noticeable difference). A full keyboard now available for typing or preferably swiping is a nice addition. And lastly the fast charging which is awesome.
There is one other thing I really like but this is just a personal preference: the new watch face which I believe like the keyboard was designed for the flatter screen.
If none of those are anything that appeals to you then you’d be wise to stay with your series 6. My wife had a series 6 which she adored, but since we’re older I suggested she try a 7 for the larger screen. She was adamant that she loved her watch and didn’t want a new one. I finally convinced her to just try it out and she fell in love with the 7 the minute she got it. Her 6 was sold a few days later
