I’ve owned a 1875 pro guide and now an 1875 impact XS so I can speak on those.
For fishing the river give me the tiller any day. For strictly fishing I absolutely loved it. Only reason I went with a boat with a windshield is that it’s more family friendly with young kids. If I were alone,
I’d own a tiller.
If you do plan on spending time on big water a tiller is still a fishing machine but in my case having the windshield, sport top, and side curtains is pretty cool. In most cases you can put more HP on the wheel than the tiller and getting around quick is good as well.
I spent many years going to lake of the woods in my pro guide and never got chased off the lake by waves that wouldn’t have chased me off in my impact.
Glass boats are truly the best ride out there but I opted for a new fully loaded impact over a used Ranger Angler less equipped for the same price.
It really comes down to where you will fish the most often and who’s coming with you.
For a few less bucks alumacraft competitors are also great boats, don’t rule those out.