The fireworks display from Las Vegas Blvd is pretty fantastic, but the boulevard is so crowded that it's hard to turn around. If you are in one of the larger strip resorts, you will probably be roped in for the display. If you don't want to take in the party, and have a room with a Strip View, the fireworks are astounding. If you're not staying at the resort, there's usually a healthy cost. You can't enter many of the casinos on the strip during the night because of private party arrangements. It's extremely crowded, and prowling the strip is a real nuisance. It's every bit as crowded on Fremont Street, but you have access to the casinos. You'll probably have to buy a ticket to get under the canopy, unless you're staying in one of the downtown motels. You won't see the strip display at all (except from some of the hotel rooms windows.) As it gets closer to midnight, mobility becomes very limited. Unless you're a real techie, the video display isn't much. Lots of live music under the canopy. Lot's of very inebriated patrons.
Anywhere you go, get there early (before dark), and plan on staying there for the duration. You probably won't be able to get out with much ease until well after midnight, unless you have a vehicle at your disposal. My wife and I both prefer Fremont Street. We're the over 60 crowd, and aren't put off by the party for NYE. We were well pleased to stay at MSS the last time we did New Years in 2014.