Til the end, its still the user's preference.
However, there is no harm trying both Fully Synthetic and Semi Synthetic.
Afterall, which you prefer, you can use it permanently.
-Engine Oil are mostly 15W50 / 10W40 / 5W50 / 0W50.
-They are much thinner and smoother for the ride.
-Easier to Start in Cold mornings.
-Much of a expensive EO but lasts abt 4000km - 5000km.
-Engine Oil are mostly 20W50.(Not firmilar with Semi, but Silkolene Semi is GD)
-They are much thicker and not as smooth as compared to Fully Synthetic 1s
-Harder to Start in cold mornings
-Much of a cheaper EO and lasts for abt 2500km to 3500km
So til the end, its still up to user's own preference as people has each and
every own's unique preferences.
Cheers and out