SP Takegawa Sports Exhaust system - This reuses the OEM heat shields so it was a small visual change. I wasn't happy with the black painted one due to paint fade from heat and corrosion. Wouldn't buy the same one again, but their
newer stainless option may have solved those issues if you're looking to retain the stock heat shields and their look. It had a slightly different shape than the OEM pipe which caused the lower heat shield to rub on my bike's aftermarket engine skid plate, don't think that would have happened with the OEM skid plate.
OUTEX Exhaust System - This is the exhaust currently on my CT125 and it may be a bit loud for some. It can be made quieter with parts that interchange, but I haven't bothered to try that. I like the aesthetic (mostly why I picked it, the old school style heat guards) and the sound. It's held up well so far. If I didn't already have the Outex I would buy it again as of right now. The Yoshimura and Over Racing options are tempting though.
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Worth mentioning that some exhausts fit both the 2020-2022 JA55 model and the 2023 JA65, while others do not. Check the item details or confirm with the vendor before buying one if you're not sure about compatability with your model year.