I thought mirrors was the best glass around. Where you can see your reflection LOL. But Ken is right go with starphire glass it really clear glass and it gives it a nice view especially for a reef tank.
How much space do you have?
Going with a 6' tank or a 4' one?
Deep Blue tanks are low iron and much cheaper than starfire.
I did not know this and scratched my 150 with the scraper I had always used on my AGA tank.
A mag cleaner works really well.