I personally feed my glider OHPW, which he loves and maintains good weight on so it works. I have also heard good things about BML. I haven't heard of SGS2 or TPG, but I did food research for my glider 4 years ago when I got him, so if these are newer I may not have heard of them.
Take a look at what the diet consists of. If it contains hard pellets like dog food, I wouldn't use it. Their teeth can't handle it (mine's are filed down pretty bad from his years before me).
I always consider a fresh diet best, so if it doesn't include fresh fruits and veggies it's a no-go, and if it's a powder with "just add water" I would steer clear as well (although some people do use instant HPW, but I just don't like "instant" food for myself let alone for my glider).
(as a side note, HPW is sometimes called Critter Love)
Here is where I buy the wambaroo powder (protein) as well as the ingredients card that comes with it to make HPW: www.thepamperedglider.com/supplements.htm
TPG honestly sounds like a good diet (just looked it up). It sounds a bit complicated to make compared to HPW, but if you like it and your gliders like it, you could definitely stick with it!