Fred Harmon, in his DVDs on maintenance, recommends using the so-called "Extended Life" antifreeze. He mentions to use the unmixed type (not the premix), using only distilled water to dilute the antifreeze to 50/50. He was not picky about brand, but he clearly showed a bottle of Peak antifreeze.
The color of that Peak antifreeze was green.
When I last changed and flushed coolant in 2017, I used Prestone (approved for Dex-Cool, but labeled for all engines) which is red/orange. The label indicated it contained ethylene glycol (required in the owner's manual) and diethylene glycol, and various rust inhibitors.
I drained the coolant last night and it did not show any evidence of problems. The coolant reservoir was clean, but I pulled, drained, and rinsed it. Will be flushing the system in the next day or two using the SuperTech "Extended Life" Walmart store brand, which is green. It also contains ethylene glycol, diethylene glycol, and various inhibitors. Will be mixing that with distilled water 50/50.
Not sure what the difference of color in the a/f makes, but the owner's manual says that the bike was shipped with green a/f containing ethylene glycol and that it's mixed 50/50.