Either option should be ok. Plenty of people have taken their hamsters away with them, plenty more have left them at home or moved them to someone else's home, as long as they're cared for its ok.
Just two days ago a lot of us travelled to Cardiff with (some of) our hamsters for the day, the two we took slept for most of the time travelling and were perfectly happy in their travel cages. For me it was about 3 hours each way in total and the hams had hours out too. Left at 8:45am and didn't get home until 10:05pm but the hams were fine.
For a travel cage I'd either buy a carry case or make a smallish bin cage. I'd probably go for the carry case if you don't have a spare small cage to use. Just make sure you get him used to it before you travel, then give him a bit of veg for water, substrate, bedding and food. He'll be fine
