Does the new DBS Altitude promotion give it the edge against other lifestyle cards like the CitiPM, OCBC 90 Degrees Card and UOB PRVI Miles card?

Yes, promotion miles are promotion miles. if you can meet the requirement for the promotion, go for it.

Assuming that you have been targetted for the 17,000 miles promotion and you have $6,000 spend coming up, it's a no brainer to sign up for the DBS Alt card to take advantage of the promotion.

On top of that, you also earn 1.5mpd for local spend made during the first 180 days which is the highest in the market at the $30k cards category.