If you don't qualify for a BTO, would you buy a re-sale HDB for $1m or a condo for $2m (assuming available financing for both, and at decently good locations)?

It depends on your goal for the property:

1. If for investment purposes - favour rental yield and appreciation

2. If for self-stay purposes for the long run - then your own factors such as proximity to MRT/facilities/family etc

If I want lifestyle, i prefer condo.

If I want financial prudent, then

1) HDB = the monthly maintanence fee for condo is way higher than HDB.

2) if you are newly wed, HDB allows you extra subsidies, $40,000 for example. None for condo

3) The extra money for Condo will attract extra interests you have to pay over the years = another extra costs