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I much preferred the performance (if you can call it that) of the CG's single, but the varadero is a bigger, more comfortable and better shielded bike for sure. I found the tiny V twin a bit gutless compared to CG, I think it got up to just over 70 mph eventually. Aside from that it's a really nice bike for a 125. When I was riding it I was around 16st so if you're lighter you would find it nippier.
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Varadero (face-lift injection model) is prob the best made 125 out there. Built nice, good for tall people, good for a roads, sound great with a dominator exhaust on them, decent mpg (80-110mpg is possible) and quick enough for a 125, it's no yzf125/cbr125 but really not far off given the same road conditions and tyres. But the Varadero rider will be more comfortable for longer distance
500 will drink fuel and 3 wheels will suck for filtering - just get a cg125 (or similar) and do your cbt. Will be faster, cheaper, easier, more fun.