You can achieve what you want to do with both. The DT has however, like a 1GB memory, the Octa I think up to 64gb card. But both machines have their menu diving in that regard - the DT: more time spent swapping samples in and out - and as mentioned above, it’s difficult not to become precious and fear deleting things.
The OT cops a lot of flack for being difficult to use, but it really isn’t. It’s two key problems I think are sometimes being lost and not being able to figure out where u are and why u have a certain result - that’s fine - that forest is part of the fun I think.
But the other thing is the OT has a very specific way of saving things, I would almost say it has a destructive workflow - any record buffers you have filled that are unsaved, are automatically wiped when the machine is turned off. This is very important -trigger happy off-switching will destroy your work if you’re not careful. You literally have to methodically go through and carefully name your buffers before you switch off - or at least carefully invoke that in your process. If you’re carefree, and say recording out two channel to a recorder, and not worried about saving, then I guess who cares. Move and keep creating, live in the destructive - or creative - world that the OT somewhat occupies.
The DT is far more modern, and is completely the opposite with saving. You just press save and that’s it. Turn if off.
edit: if your samples are coming from elsewhere, and you have a lot of them, I would recommend the OT. So much storage, and then buffers aren’t an issue, you’re just loading your samples as needed to a project. The DT actually has a better sampling workflow in that regard, but the OT mostly trumps it in sonic flexibility. As mentioned above the DT has some nice touches in this area that can produce pleasing results, but the OT has the breadth of techniques in this terrain. Even if you’re intentions are simple sample loading with the OT, you will absolutely be pulled into its fascinating sampling world.
It’s tough with Elektron, no one box is a magic land of chocolate. They all have things the others don’t, and you have to put up with that, which ever one you choose.