I have been heavily reading posts here and love the site! Planning to convert one bedroom into an office and bought enough Builder's Pride Emperial Teak from LL to cover the ~160sqft. I eventually plan to do another ~1000sqft downstairs after saving funds.

The office is a second floor bedroom with 3/4" plywood I believe. Downstairs is concrete perimeter rasied T&G floorboards w/ roofing felt and 3/8" plywood atop.

I have read numerous posts comparing cleats vs staples, and it seems staples will hands down bite harder into substrate, but will likely be more abusive to the extreme hardwoods like Cumaru. I dont know what type or thickness of plank I'll end up with downstairs, but obviously only want to buy one nailer. I really like to look of the Cumaru as it matches my stair railings so close.

1) Any thoughts on the Builder's Pride Emperial Teak 5/8" x 3 1/2"?

2) For a crafty/mechanical noob, are staples or cleats easier? Which is best for teak?

3) It seems the following mfgr's and nailers are most referenced. Which nailer and model is best? I see some dont mention compatiblity for 5/8", or only up to 5/8"...i may end up w/ 3/4" downstairs so does this matter? Primatech P240/260, Bostitch MIIIFS/FN, Powernail P50, Porter-Cable FCN200

Any parting thoughts you may have to help my hardwood project(s) are extremely welcomed.

Cleats.

Cleats don't displace wood as much as staples so you'll get less splitting and raised swells on the upper surface of the wood, which can be noticeable in the light, particularly prefinished flooring. Also since this will be your first flooring install cleats are far easier to pull out than staples. Staples have strong holding power making it more difficult to pull up a problem board that's too bent or you've misfired on (accidentally shooting a nail on top of the board). Pulling up a cleat fastened board is easier.

I've only used a Bostitch with a converter kit for cleats, been using it for years.