I expect this one to be a bit of personal preference.

If you think about:
- laptop
- kindle
- tablet
- phone
- camera
- GPS
They all can have some levels of overlapping uses and areas where they are individually best. If you have a minimalist mindset, you can narrow that list down pretty small as the tradeoff of perhaps not having the ideal solution for every task. For example, a smart phone can cover many use cases done by other devices above. For some that is probably ideal.

It depends a bit on the sorts of tasks you want to do. For example, I find keeping a blog and processing photos easier with a laptop than a tablet - and easier with a tablet than a phone. I find navigation in the field easier with my phone than my tablet. I find reading easiest on the kindle, and easier on a tablet than a phone. Listening to podcasts/audios seems equally easy on a phone/tablet and easier than a laptop. I find it easier to take photos with my camera than my phone, and the phone is easier than my tablet (*).

You are in best position to decide how much of that tradeoff you want to make between minimalism and ease for tasks you will do. Personally, I've erred on the side of carrying too many tech toys and may even have a trip or two where I've had at least one of every item on the list above . However, I would actually argue in favor of going the other direction: decide to leave the tablet at home. It won't be catastrophic without it, your trip isn't that long and if it were really missed - then you can add it back again on the trip after this one.

(*) Some of this might be because I haven't figured out workflows with some of these devices - but sometimes the device/software is focused on particular tasks.