Using conventional mortgage as purchase loan on BRRR?

[Donald S.]

I saw a post yesterday where a guy used a conventional loan to do the purchase half and refi half of the BRRRR strategy. I'm wondering the pros and cons of this vs using private/hard money loans?

For cons I can only think of the time it takes to close a conventional, maybe the impact to your credit score? 

I'm getting ready to make offers on some potential deals and want to see if I should go the conventional route for both parts also. 

Thoughts?