>...How long will it last?
Depends on the construction. I have some that are not very good, DIY tank that probably won't last a few months, and I also have seem some bullet-proof custom-made one that will last for decades.
However, some glass tank has nice silicone work that make it almost invisible. If you have the money, you can custom order a glass tank with round corners, for example (very difficult to get for large size).
All my larger tank (> 30 gal) are acrylic, FWIW, and I hate bowfront due to the extra distortions.