Look carefully, I said "It is not that simple.", because some people only compare the one time Tax cut rate of RRSP with 5% interest rate on mortgage and forget mortgage interest rate has to be paid every year till paid off.
you are somehow right. The performance of the RRSP is a key to say which one is better.
If you can make RRSP每年7-15%利滚利的增长, of course buying RRSP is better than paying mortgage, but who can guaranty that? However the 5% or more interest on Mortgage is fixed.
so it is a personal choice here, not simple answer.