For people like many of us here who really like the outdoors and hiking, it is an easy decision. But MOST people find out a thru-hike is not as much fun as they thought it would be (boring, lonely, cold, wet, dirty, muddy, buggy, steep, difficult) and they decide not to finish the trail. For a smaller percentage of people, a thru-hike is one of the very best experiences of their life. (difficult, wet, buggy, adventurous, scenic, challenging, fun.)
Frankly, I think that asking your question here is not going to be very helpful in deciding what's best for you, because in a very real sense we tend to be "extremists." If you don't know what you want to do, take a week-long hike and think about it and maybe the answer will become clear.