My car has a Gates blue-belt that was installed at the last major which was 2009. The car has 25K since then and the belt is positively in excellent condition and does NOT need to be changed for a few years yet.
Timing belt discussions end up like politics or artificial turf arguments - they often go nowhere and no one will convince anyone to change their mind. However, changing a modern belt every few years is absolutely dumb. I mean - why not just change the timing belt after every drive? That will gaurantee it cant break? Right? Or, better yet, just dont drive the car. Thats the only way to really preserve that belt
In other words, be sensible and have the tension checked every year. Check for cracks, wear, things like that. Honestly, it is very likely that some other part or belt or component will need attention long before the belt does and in that case you may as well change the belt "while you're in there".
Get the Gates blue belt and have it installed properly. Then, check it every year. Replace it every 5-6 years, IMO or even longer if you drive the car regularly. Like I said, the water pump or cam seals will probably leak before the belt needs to be changed.
Thats my take on it.