Take over existing low interest loan or get new financing?

[Ryan Armstrong]

I have an opportunity to do a land contract for single family.  With the land contract, I would keep their 2.99% interest payment of $1230/month (including taxes & insurance), give them $ down, and it would be paid off in 9 years.  Or...get my own new financing at 6.??% for 20 years.

My payment would be much lower, say roughly $850, which will generate more monthly cash flow, but I'm adding 12 years of payments. 

Rents in the area are between $850 and $1500/mo for a 3/2.  I'd like some opinions on which option would be better and why...