Here listed top 10 bitcoin miners hardware.
1. Bitmain Antiminer S19 Pro
2. Antiminer T9+
3. AvalonMiner A1166 Pro
4. AvalonMiner 1246
5. Whatsminer M30s++
6. Whatsminer M32-62T
7. Bitmain Antiminer S5
8. DragonMint T1
9. Antiminer S9
...
Well considering many of those are
very old, only available second hand, and would run at a loss for most people, I crossed off a number of them.
I deleted the last one since they are not even Bitcoin miners.
Anyone selling you the ones crossed off, is probably thinking you are a fool and you are willing to buy anything with the word Bitcoin on it.
You are very true, old systems never make any money with Bitcoin. I tried in local forums for buying Antminer, but on calculation their is no profit for me.
What to mine showed me loss a year back.
I think the OP later can have profit if the BTC price moves up else mining is worse for most countries.