Congrats on the camera!
Until 6 months ago, I would have been on the same page as AirMapper -- but more recently, I'm in favour of a tablet, specifically the Pro-level tablets like the iPad Pro. I recently gave up my laptop in favour of an iPad Pro and I don't regret it at all -- it's really good for my use case. Everything I used to do on a laptop, I was able to do on the iPad, but for various reasons it was easier, more intuitive, and faster on the iPad than the laptop. It's like upgrading from a sponge and soap to a dishwasher -- the way I wash my dishes is now very different, but they come out clean with less work on my part!
My editing workflow is substantially faster and more intuitive on an iPad, for both still and video images. The iPad also will work with popular overlanding apps -- one device doing nav, photos, journals, emails, etc. instead of having multiple devices is handy for space and simplicity, though of course one still has to plan for redundancies and failures (as you would with any tool). Additionally, Tablets are handy for entertainment given their massive battery life -- on our latest trip, we were able to download a bunch of Netflix shows that we could relax and watch in the tent while we were waiting for some real bad weather to pass. The point is, having one device for all of the things was really nice.
I purchased an iPad Pro with a fair bit of internal storage and pay monthly for the multi-terabyte option from iCloud, so when I'm grid I have all my files. However, there are also plenty of storage options for the iPads in terms of external drives (currently as high as 2 TB), with even more robust external support rumoured for future iterations of iOS, so backups and file storage is just as easy off grid.
All that being said you may already have devices that do all the above, or you may not need the above options in the same way, in which case a cheaper laptop might be easier/better for your use case. Pro-level iPads have a lot going for them though, and are worth a serious look.