The ideal DTG will be the one that suits your needs and business requirements. My personal opinion about sales and marketing is you have to detach your emotions from the process. Most people have a general idea of what they want, but its the salesperson that will sway that final judgement. It's their job to be personable, and some are good enough to talk a turtle out of its shell.
That's the role of sales, especially when its based on commission. They key off specific features just like in a car, to build value in the product. The points they key off of is what the customer has stated is their key values. For example one would be speed, or another would be printing on black shirts. Both were elements the customer stated were of interest, and a good salesman would key off of those "triggers" when talking to someone. Selling those points into the presentation on the product.
Then just like a car salesman builds emotions into the presentation of the car, they take for a test drive! Same thing here only they print your image, or one that is a standard print for them. This builds emotions and to first time buyers its the WoW moment. It doesn't matter if the person has been doing this 10 years, there is some wow factor captured if its the first time watching a product their interested in do its job.
Then the salesman sends them off to go compare their speed against the competition. So the would be prospect now goes around to compare the other products on the market. Sure enough they will go on the hunt, because their new found "friend" who is in the know is telling them all about the other products so they/you don't make a bad investment.
So my opinion is bottom line, this isn't personal it's business. So check the forums, see whats going on in the different threads. Also touch base with the various decorator's and read up on everything. Send people 1 on 1 emails to get their take on the product. You want the good, the bad, and the ugly. Get it on everyone, watch the videos, up keep etc. Then base your decision on your business model and what works best for you and your customer. Just like when comparing black tee's not all are the same color black. Just my few cents