This is a very complex topic for sure. The outcome however of extensive research and many other try-outs has been that offering Flex is simply not feasible. Personally I believe it’s suitable for smaller companies (like f.ex your local print shop or similar) that have a better possibility to control the incoming orders and delivery times.
Even with hiring more team members (believe me, we’ve tried it before making this decision), we were not able to keep up with the growing demand and seasonal peaks while of course keeping a consistent quality - without having to significantly increase the prices for Flex-printing.
Flex printing is not only manual labour but a very complicated task requiring expertise. Training a new employee takes weeks.
Now, digital printing is actually pretty awesome and comparing DD and Flex is a bit like comparing apples and oranges - in my opinion. Flex-printing has significant print technic limitations: DD can print pretty much any image in the world. The two are so different, I find it hard to even compare them. One is definitely not “better quality” than the other and we have the best Digital Direct machines in the market. We also did some research on this topic and a majority of customers in fact prefer Digital Direct: it’s soft, more breathable, better suited for thinner fabrics, and even larger prints will not “weigh down” the fabric. We also heard the argument that the quality will not suffer even if you leave it for a week in the washing basket 
But of course, if you are after the specific look & feel of Flex-print, DD might not be what you are looking for. I’d recommend for you to try out a colourful print on a light-ish background to see the how amazing & vibrant the colours can be 