When it comes to presses I've had a bunch of 15x15 presses and they are great really all you need, but at times depending on what your producing a 16x20 press can help you speed up your process. For example if your doing allot of oversized designs. Not needed for a first press, but consider upgrading to one at some point.

The downside is it makes it hard to work with some smaller garments so you will need to get you a set of pillows.

There are only 2 reason i would consider purchasing a press smaller then 15x15 the first of which is i am in an extreme case of being a mobile printer and every inch and pound counts. in this case this will do the job. A standard print size would be about 12"x12" or 11.5"x11.5" on a craft cutter and in this case you would potentially have to press each garment twice and the time it would take for regular production isn't worth the saving in my opinion

The second is if i could barely could save enough money to get it. I really despise the cheap presses of amazon i considered them as throw always.I purchased and i didn't have much guidance when i started. So if i had to in my opinion it's more important to jump in and get started the money will come in and you can upgrade then you will have a super reliable backup press or you can sell the old one and help someone else get started.