It is possible to achieve high typing speed on both; I did just that for a few years by switching back and forth on a regular basis. In the end the inconvenience simply wasn’t worth it and I gave up.
Not the original commenter, but I had a similar experience, and gave up QWERTY. I point and peck the few times I have to use it (which isn't often, except on phones where it doesn't really matter for me) and that's worked well enough for me for many years.
