I bought this one, it works great although the auto-drain pump does take quite a few minutes to drain the tank & it doesn't dehumidify while doing this which can cause RH spikes. It would probably be fine but I choose to manually dump it whenever possible & leave the pump as a backup.
Don't cheap out & buy a small one, you'll just spend more money than you would've when you inevitably replace it.
My tent is in a basement in Canada, so it's naturally high humidity. Without a dehumidifier it's at 80% on a good day. If you have the expenses to buy one, I recommend this one. It's a high humidity dehumidifier. The fan runs 24/7 to sample the air, but the compressor only kicks in when needed. Keeps my whole basement at whatever humidity I choose - no issues.