For own stay, is it better to buy new house or buy land and build own house?

We bought a mid range house (~RM1M) from a respectable developer (top 5 in Malaysia), thinking that their quality will be better.  Unfortunately, we know that is not true on the very first time we got our keys.    A lot of time is needed to to talk to the developer and their contractors will used the cheapest "coverup method" to close the case.  After DLP, the real problem appears.  Need additional cost to remove those "coverup repairs", before actual repair work can commence.    The developer can even threaten me, not to share our joint-inspection video to public.   

So, anyone out there faced or facing same issue?    If you have a chance to get a new house; would you
1) buy new house from developer,
2) buy 2nd hand house to renovate or
3) buy land and build new house.   

For those house owners who (bought or built their houses after 2018) please feel free to share ur experiences.

Thanks.