We have a 125 gallon acrylic with saltwater. It has worked well for us. It has a few scratches, but nothing too bad. They can be buffed out. We haven't had any problems with fine cracks on it.
One nice thing about an acrylic is it's easier to move, if you ever need to, and they're not as heavy. Two of us moved the 125 g, but we'd have probably needed several helpers for a glass tank.
Scraping coraline off acrylic is a pain, because you do need to be careful not to scratch and you can't use anything metal.
We bought ours second hand, and it was relatively inexpensive.
Where we live it's both really hot and earthquake-prone. Because acrylic is less likely to crack in an earthquake, and because it insulates better, it has worked out well.
Glass and acrylic both have their advantages and disadvantages, but it often comes down to price.