Worth cheap or expensive suit ?

Hi everyone,
I’m currently in Bangkok and planning to have a custom suit made. I’ve already read a few articles (like the one about cheap suits in Bangkok), but I’d really like to hear real experiences from people who have actually bought one.
I’m trying to decide between:
a cheap custom suit (around 3,000–8,000 THB), or
spending more (12,000–15,000 THB) for a higher-quality tailor.
My questions are:
Is the quality difference really worth the extra money?
Do the cheaper suits hold up well after a few years, or do they start looking worn quickly?
Which tailors would you personally recommend, and why?
Are there any places I should avoid?
Which areas are best for tailoring—Sukhumvit, Silom, MBK, or somewhere else?

For context: I’m looking for a versatile suit that I can wear to weddings, formal events, and balls for many years, so durability and fit are more important than getting the absolute cheapest option.

I’d really appreciate recommendations based on your own experience. Thanks!