I don't think the fact it scratches more easily should make any difference to the decision to buy it. At the end of the day, if you look after it and don't use magnet algae cleaners you shouldn't scratch it. People don't take enough care of their tanks IMO. I'm not tarring everyone with the same brush but the amount of tanks for sale on Ebay which are scratched to burglary (yes I changed the word, lol), is beyond belief. But what amazes me even more is that people BUY them ! I saw a Juwel 240 for sale in my LFS that was so scratched I cannot imagine being able to view the fish or plants nicely, but it sold nevertheless.
Anyway, back on track, IMO if you take care of your purchase you should not find any problems. The only thing to consider is that the point of optiwhite is on the whole to have an open top tank. This will shove a LOT more evaporated water into your home. Central heating and good ventilation will mean this is not a problem, but I had to get rid of mine cos it was in the bedroom where I prefer the temp to be lower and waking up to windows coated in water each morning was too much to endure.