Going from 1-2 may be a lot easier but when you start adding more than 2 and depending on how high the structure is you get into fire escapes, sprinkler systems etc...The more important question you need to ask is not is there a market for this but can I legally make a 2 unit within the local building codes and keep it financially on point so the project will still be profitable when completed

They will also save you a lot of time and effort jumping through hoops of permitting, zoning and make the build process much easier.  

I would recommend adding your location to your profile - that will make it easier for investors in your region to connect with you.

Check to see what counts as an accessory dwelling in Brantford - this would be a triplex in all but name and might be easier permit wise.

MFH offers so much more from the economy of scale perspective and you can achieve the desired results faster and easier too.

It's much easier to find good rental homes in major cities where you can find decent homes for ~$80-$100k that follow the 1% rule for rent and can cashflow.

and which is the safer easier option in your opion?

Easier to maintain and then you don't have to worry about it.I definitely would not pass on it just because of the asbestos.

We need to increase the availability of affordable housing targeted to those most in need — but this initiative is the wrong approach that will only make the problem worse.” - California NAACP President Alice Huffman

It keeps the pet urine from seeping down into the subfloor and makes the make readies easier on the pocketbook.