I am in the process of building a 2550T and had the same question in another thread. I was at the Florida ITCC in Maitland on Saturday and the Bandit rep was there. I posed that question to him and with his personal experience on the machines, he recommend to use the Green teeth as they work better for the smaller machines 2550 and below and use the New river on 2600 series and above. The engines are just too small for the teeth.
With green teeth some people have been only getting 2 turns. You will get 3 if you rotate sooner. Sharp teeth, fast cut.
New river has 2 cutting edges if you rotate sides. Tip teeth size is dependant on the engine size with the Short/short increasing the wear on the wheel.
Some research you will find the New River wheel itself is that the wheel is only good for about 600hrs. The HD solved a bit of that problem with a build up on the wear points. The Green Teeth wheel lasts longer. Not sure on hours.
I do not have one, just been data mining everything to get to this build point. Sometimes there are too many options. lol.