I went through this route before thinking of getting used scooters as my first bike, happened to shortlist the same 2 you mentioned here, NMAX and PCX.
Yamaha bikes gave me the fear of them been heavily modded. Cosmetic mod is ok, mechanical mod is the one I am afraid of, unless you know the exact mod put in and able to maintain them after.
Another fear I have is theft rates on Yamaha bikes.
However, selling away an NMAX is much easier than PCX.
TPS problem with PCX is a cheap and easy fix if it ever occur. Most likely it won't occur if you buy used 'cos the owner might have replaced the TPS. It was never a concern for me.
PCX no worry about theft. Not fast bike, not much mods to satisfy those kaki modder. 😬
In the end is what suits you lah.
Both are equally good. If you want easy disposal after roughing it out, go for Nmax. If you want low key and fuel saving, PCX.
What do you mean by the mechanical mod part? Meaning certain stuff need to mod to make the ride nicer?
I'm actually not looking for speed. I'm more towards comfortable cruising santai ride. And maybe mod a bit on the look.
Tbh, how often are these kinda scooters get stolen? If only park inside mall and condo shouldn't have such problems right? I know nothing about bike theft 😅