unfortunately there is fit for all answer. T9 and S9 there are pro and cons and home vs garage, there are pro and cons.
Buy used there is pro and cons. it is all up to your specific setup. Best try a few and see how it work for you and go from there.
"Should I buy 10 of these or 10 or the T9. Planning on building my first farm. Want to start it in my house and once I figured it out and it generates enough cash flow to rent a place out for it and scale it up."
Serious question I am thinking about investing some money into these and want to try to a little mining side business and expand it after they pay themselves off.
Well, if you're wanting to generate cash flow, then you don't want to start 10 "in you house" nor do you want to buy 10 T9s that use 3,388.2W more to produce the same hashrate as 10 S9s.
I figure I will start off with 3 in my house off a 240v and if it runs smoothly quickly get 7 more or so and rent out a place or find a garage to put them in with the right electrical setup and create some shelves and design some cooling methods to pipe out the air. I think it would be smart for me to run a few and get the hang of it before I buy all 10 maybe I just buy 1 then if I understand it but 9 or 10 more? I was really big into mining back in 2011 with my computer and gpu when that was first a thing but stopped after it was no longer feasible. I have come a long way from losing 100s of coins in a dead hard drive years ago (was like 500$ it was the $5 bubble haha) but there is no reason to be salty about losses and what not. I always was a believer and I now with the coin value so high I figure why not spend 10 coins or so and do what I loved when I first got into it.
Would you have any recommendations for the t9's or any reason I should not buy them? Do I buy new or used? There is so much info out there lately and I feel I can't read it all and asking questions is the quicker and faster approach