ive never heard the dragonfly but i'm gonna assume the sound performance will be similar to the v20 (i have a v30 which has newer chips). i think rather than think about sound experience, you should consider which phone os you're more used to
Had phone + dac/amp for years for everyday commuting pleasure.
My biggest gripe was portability (phone + cable + dac) and battery life.
Now came the V20.
Is it par w/ my dac/amp... No. But it's a AIO. No more dangling otg and dac/amp. No more drained batteries. And when commuting, w/ the noise and everything. Don't care much on SQ differences.