in my opinion, there are few, if any, advantages in a lease with the option to buy arrangement.
The tenant/buyer stands to lose his or her deposit money if they don't buy the home (for any reason) at the end of the lease - so, if you can't qualify now for a loan, you better be sure you will qualify later or you will forfeit that money.
There are a number of other dangers lurking .
You better make sure you fullly understand what is involved and what risks you are taking.
I think you're better off renting (saving money, improvng credit scores, etc) until you can buy a home in the usual way.