1 Night in Alishan Worth it from Taipei?

Hello,

We have 2 days spare from our 6 day trip spare whilst in Taiwan. So far we are planning 3 days in Taipei, 1 day to Jiufen/Shifen.

We have 2 days left and we are considering doing Alishan and the scenic train but it looks like the route would take around 5 hours there and we wouldn't get there till late afternoon, and it would be 5 hours back the next day too. I've tried to look around and there seems to be mixed opinions, is the trip to Alishan worth it? Or are we better off spending that time taking Taipei slower or other day trips (looking at Maokong Gondola as an alternative).

I am quite keen on Alishan going by pictures but it seems like it will be quite a journey.