It depends on perspective.
We rack up very low kilometres in both. The Mazda 2 has just ticked over to 40,000 km.
I bought the Vios about 10 years ago now. 230,000 baht, plus 30,000 baht to get it to my mechanical standards. Probably get 80,000 baht for it now. Utterly reliable.
The Vios depreciation is 16,000 baht/year.
I doubt very much the NETA depreciation is anything like that, given the way the new RRP has tumbled.
It might be very nice to have a new NETA, to impress friends and neighbors. Not interested.
I could only charge it at the house, not the condo. It might get used once every 3-6 months, driving to Chiang Mai. I'd probably have range anxiety.
My very good independent mechanic usually charges me 1000 - 1500 baht for a service on either vehicle, and he does a much better job than some apprentice at a dealership. Checks everything.
What's the point? It does not make financial sense to me. YMMV.