STR's can perform even better as you know but its all about location and timing.

In response, I had a plumber and a water restoration company come to assess the situation.The restoration company cut into the drywall, and the plumber thoroughly inspected all the pipes, performed a leak test, and conducted a pressure test.

Are there other notes you feel perform better than these?

Note investing can be divided into performing vs non performing.  

I've been watching Chad Carson's videos and his approach of accumulating more properties than you need, then start using that income to pay off mortgages and cull the lower performing properties makes sense to me. 

How about performance and collateral types?

If you can just make sure you are buying right, everything else falls into place eventually.There are markets that perform better than others, but unless you are holding long-term or building rentals, you shouldn't really care too much since flipping is all about buying at the right price for that market:

With minor cosmetic upgrades, he increased the rents, and now it’s one of the best-performing properties in his portfolio.I also had a client in Providence last year who bought a fourplex.

----------------------------------------------------------------------------------------------------------------I have the cost list for the classes but they state they are tailored to meAll together @ retail - $29,976 without Asset Protection/Entity Structuring - $17,976 Money School Essentials (Virtual 3 day plus 1 year recordings plus access to library)$1891PMC Premier - 1497/PMC Accelerator coaching -2997$5,494PMC RE Performance Bus Tour (12 week RE Coaching) - 7997/VIP Money Tank - 1297 (EACH)$10,591Asset Protection/Entity Structuring $12,000Success Team Tuition - $20,488 WITHOUT ASSET - $12,488 Money School Essentials( Live Virtual 3 day plus 1 year recordings and access to library)includedPMC Premier - 997/ PMC Accelerator coaching - 2497$3,494BUS TOUR/PMC RE 12 week on Demand - 6997Money Tank -2 TICKETS - 997 EACH$8,991API LAW (asset protection/entity/trust)$8,000-------------------------------------------------------------------------------------------------------------------------This has all been over the phone or email. 

Tough to stay disciplined as "Past performance is no guarantee of future results".