I have and fly both.
Comparing them for "better" is a lot like comparing a NASCAR racer to a Dirt-track racer. Both are cars (in the technical sense), both race, both use similar skills -- practice in one will also benefit the other -- but the goals and how you get to them, not the same.
I find DLGs more of a challenge, and good for working out a bit of stress at the end of the day (surprise, surprise, I fly them more
). They're also better for refining the skills for hunting, finding and milking the smallest of thermals, and sharpening your flying chops. They're also 4-10 times more expensive beyond the entry models . . . and with the cost, they do fly several times better, but not always in line with the cost.
The 2m foamy gliders are good for the slow ride down, and with practice, milking active air for a longer ride down -- a good way to relax with a mellow flight, watching a plane float from one side of the sky or another, and repeat at will until the battery is done. Add on some lights and you may no longer spend time thermaling, but night-gliding is as peaceful . . . as the bugs will let you be.
In a way they also seem a bit like the two kinds of fishing: The fisherman who hunts for the biggest fish on the lake, vs the fisherman who won't bait his hook because he doesn't want his "fishing" disturbed by releasing the fish he just caught. Neither is wrong, and depending on the day (or the hour) they can both be the same guy.
On some days, I have been both of those guys . . . and those are good days