I am only new to hear but there is a fair bit of info on here regarding seats at Singapore, some people like been close/down low to track while others prefer up higher. I would probably go a bit higher as you will have less chance of obstructions from marshall flag points and the fence, you will probably see more from up higher as well, but they may also depend on the stand and position. I have not been to Singpore yet so cant comment on T1. It may be to late to ask these questions if you already bought tickets, its worth a try if you want to relocate.