Is the unlimited rate of $119 is a monthly basis?
If yes then you can save more compared to the fixed rate since you said it's $160/month?

The question is if the unlimited rate has a wattage limit? I mean how many miners you can able to run at $119 unlimited rates?

One s19/pro can consume around $160 every month for a $0.065 rate so if choose the unlimited rate you can save more but the problem is if your miner can run stable.

Both of them have pros and cons it's your choice if you know that your miner can run stable then choose unlimited but if not I guess fixed rate would be your last choice.