I've renovated 2 places and compared few contractors.

It's actually quite subjective and difficult to compare them, because not apple to apple (different materials, design, style, etc.)

The best is find one based near your reno site, so convenient for u and them to renovate your place. In the end, it's not the price, it's also the service. Get those that have positive attitudes (not those TIDAK APA kind) and are proactive (not blur, make oops mistakes)