Starphire (low iron) glass is definetly softer but whether that will be a factor in daily use is debatable, as seen in this thread. Float glass does have a green tint as compared to starphire which is nearly colorless, but how noticeable that is depends on the thickness. Last consideration is cost. How much will you pay to NOT have a slight green tint when looking into the tank. For my two cents, neither of the tanks I had custom built have included starphire, I just couldn't justify the extra cost. One had 1/2" glass, the current one has 3/8"
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