I would be honest in my intentions, but iterate that what you do can be beneficial to the owner if both of your incentives match up.

If I had the choice for around the same price, I would use real barn board.Home depot recently started selling a weathered looking rough pine board at more reasonable prices, I'm planning on using that on a flip in the next few weeks.

So I need help with knowing how to make the better choice.

In some cases it might actually be beneficial for you to buy a house on leasehold but only if you do it right!

Is it a choice based on one's market, class of properties or is that generally the case?...

As for new investors, I can even offer some advice that could help remedy the "naïvety" - something that will even help you in your endeavor to invest in regardless of your vehicle of choice! 

If you have time take a look at my blog and let me know which blogs stood out, and why they may have been beneficial to you? 

The answer, if those were the only choices, would be #1.Luckily, those aren't the only choices, but #1 would be a part of it.

So if the choice is between paying the costs on your own or using HML to do it, the HML route will allow you to leverage more of your money.  

I don't know much about what a turn key actually is other than it's already rehabbed and ready to go, is that something really beneficial to a REI newcomer?