One point of difference is that DO and Linode both have fixed SSD sizes. This company allows you to mix and match CPU, disk and RAM. Neither to the former allow that (at least not yet).
That's not true with Linode, you can add additional disk, memory and transfer under the extra's menu once you've purchased a slot. They'll migrate you as required.
Neat. I did not know that. Do they post that information anywhere on the public, you-haven't-paid-for-this-yet site? I've been trying to figure out what I'll need for hosting for the last few months. Linode looked best, but I worried about having to get beefing systems just to get more HD.