Hi, newbie here.
My mom has done the train, she enjoyed the views but the downside is you don't make stops. So you are on the train going up listening to the narrator, when you go back to Skagway, no narrator.
I've done Hwy which is great because they DO make stops, and the views are different.
There are tours that do both which would be my pick when I go back in July. Train going up, then bus/van going back to Skagway. If your ship doesn't offer this tour, there are independent tours such as Dyea Dave. I think they are around $150 for train up/van back.