I like it the way it is.
But, if the twice-yearly changeover is eliminated, it should be standard time, because it would most closely align with astronomical time, at least near the center of each time zone.
Permanent DST is, IMHO, silly.  The whole point of DST, where the clocks don't match the real time, is so businesses and schools could all open and close an hour earlier during the summer months without having to post changed hours twice a year.  If you really want year-round DST, use standard time and let businesses adjust their hours once.  A business open from, say, 7-4 on standard time is exactly the same thing as being open from 8-5 on DST, so what's the justification for having the clocks not match real time?.
I like the switchover because I liked having longer daylight after getting out of school or work during the warmer months, and I didn't like going to school or work in the dark during the winter.  Having the longer daylight after work during the cold months is less important because it's either too cold, or even with DST there isn't enough daylight to do much outside anyway.  If you made either one permanent, businesses could change their hours twice a year but few would.
I remember walking to school in the dark during the short lived "permanent" DST during the 1970s.  People hated it, not least because there was an increase in the number of accidents with more people (including school buses!) driving in the dark morning hours.
Some people mentioned GMT (universal or Zulu time).  It's the standard in aviation and other activities where you need to synchronize things across time zones.