I'm a semi-serious amateur photographer, and I've been shooting Las Vegas off and on since the 1970s. (A couple links below.)
I've used a variety of cameras over the years in Las Vegas, but very seldom anything I would call high end. On this last trip I used a Fuji HS30, a Canon GIII, and a beat-up falling-apart Kodak Easyshare. One niche I fall into is using mid-century film cameras. The combination of 1960s-1970s glass and 21st. century film hits a sweet spot. Sensitive and very clean and smooth film and higher-quality optics from a vintage when film was typically not that sensitive. One thing I've been using for some of the recent night shots in LV is Cinestill 800 film, which is a re-spooled tungsten-balanced Eastman motion picture film.
I always have a camera with me, usually a simple P&S but one with a good lens. Usually an Olympus Stylus Zoom or the old Kodak.
Personally, I use my iPhone and I have an advanced point and shoot (Canon G9X) that I use to take photos of the trip/vacation.
Canon makes good products, both plain and fancy, and I use a few of them.
As to using a phone, each to his or her own, and if it works for you, all the better, but I have yet to see a cam phone that REALLY has the optics or the image quality of a good recent P&S film or digital camera, particularly in lower-light situations or when printed 8x10 or larger.
I personally LOVE my Canon....it gets awesome night shots and photographs the strip at night very well.
If this is the one I'm thinking of (one of the higher-end Powershot series?) you should be able to get stunning night shots and it should be adequate for great-looking prints up to 13x19 (A3+ "Super B") or so. If you've never done larger prints of your better photos, try it!
The only thing I don't like about those, and again, this is me, if it works for you all the better, is that I NEED a viewfinder! I just can't compose or concentrate when looking at a video image on the back of a camera. I need it up to my eye and I need to concentrate a bit on the composition.
And being that I'm coming from Hawaii, I don't really want to lug a DSLR on the plane.
I usually carry cameras in my carry-on bag. If I have film with me I'll ask for a hand inspection at security. They're used to it.
Or even lug it around for that matter.
I'll always carry a P&S, or sometimes a smaller rangefinder, around with me in my everyday purse. When I go on a shoot or a photo walk I'll often use a wrist strap. I'll use a shoulder strap only when necessary.
Here are a couple links to some of my LV photos over the years (decades). The first is to a newer gallery, with "Las Vegas" from the tag cloud pre-selected. The second is my photo blog which has many LV shots over many years.
http://www.demare.me/gallery/index.php/tag/3/LasVegas
http://omababe.blogspot.com/