Modular is not always cheaper but can be faster.

But that's definitely the faster starting point.

Do you think it is better to move to an area where the houses are cheaper but might take a little longer to sell (for example: Ohio) or go to a place like Northern Colorado where the homes cost a little more but flip faster?  

This results in faster, cheaper, better work.

@Derek Meyer, other things to think of: single families tend to appreciate faster than duplexes.  

If you then save up that housing cost, you will be able to buy your next investment that much faster. 

Plus, a fix and flip will likely put more cash in your pocket faster.  

In precovid Chicago it took 6 month to evict and 2 years to foreclose, I'm sure other big blue cities had a similar timeline.Now you will probably have to double that time.Let's say they lift moratorium tomorrow, red states will be moving through the process much faster, blue states will take the longest.So there will be no critical mass hiting the market at the same time.

I want to replace my income with real estate and the BRRRR method seemed like a good way to get there faster than buying a turnkey investment.

I ended up getting 8 SFRs and since I had cash, the sellers were taking mine first as (1) they didn't have to wait for a loan to get approved which during this hot time can take a long time and (2) I could close faster than anyone else.