Jerry, Here's the view from my room (we're not the photo pros like you are) at the Marriott Fallsview (not to be confused with Marriott Gateway). It was terrific and we had a great time, excellent staff, nice concierge lounge (with wonderful view). Gateway was across the street and looked very nice also ( Gateway had a terrace, where we went outside and sat for a while). We were able to walk all around town from our hotel. You probably can't go wrong with either one, but Fallsview was a blast. Enjoy.
I stayed at the Marriott Fallsview a couple of years ago. I agree with all the comments. I had a wonderful view however, the window collected moisture on the outside in the evening and the view was not that great after dark. I walked to everything that I wanted including crossing into the US. If you intend to do so you will need a passport. The view is best from Canada but there are many things to do on the US side. They gave me breakfast coupons too.
I paid for the high floor view room. I wanted it and did not want to be disappointed if I didn't get upgraded to it.
I really like the Marriott Fallsview as I could actually see the falls from my room so falls into the category of a room with a view that qualifies as sightseeing. A few ther properties in this category that come to mind are County Hall (Big Ben), Residence Inn on Avenue of the Americas in NYC (Empire State Building or Bryant Park), Marriott Marquies (Times Square), Financial Center (Statue of Liberty), etc. Its is great when you are dead tired and feel like you can not go another step to be able to look out the window at the sites and not feel guilty about not being out there seeing more things.
Since Niagara Falls was drivable from MI, we spent many summers there as kids, and later in life it was the drive path of the shortest distance between MI and New England. My all time favorite activity is the Maid of the Mist. There is just nothing like it.
My cousin liked it so much, that he filmed the wedding scene from the office on the Maid of the Mist.