Hi wolfsatplay,
Well the obvious difference is hair length in the donor, FUT only requires the strip area to be shaved and removed so with a little hair length the suture line is hidden; whereas FUE requires the donor to be shaved, so if you normally keep your hair longer there will be a change in style, so the punch points will be visible. Then it is just a case of waiting for your hair in the donor to grow longer again.
The suture is removed generally around day 10 post op, the punch extraction points start to fade also over the first 2 weeks. If going for FUE and you normally wear your hair longer it maybe an idea to cut it shorter prior to the operation so the change for you and others is not so drastic, and being asked why you have shaved.
Recipient area, this greatly depends on the surface treated and the amount of native hair you still have. Possibly you could hide the area with a little clever styling. Dependent on the situation the clinic may have to shave your native hair in the recipient area to place a correct density or go over any miniaturisation.
Initially you will have scabbing, and maybe a little swelling in the first days, the scabbing will release itself with washing normally no more than 2 weeks. The area will remain reddish pink for a while but once clean if you cannot wear a hat or cover you could use a little foundation to mask it.
You will keep the grafted hair for about a month, normally close to 30 days it falls and then you are basically back to where you started.
Hope this helps a little, 20 days is a good amount of time though, no one can say you will totally back to normal but the worst of the healing is over.