Can't say I share this sentiment, while it may not be the fastest Pi like board, the Raspberry Pi does everything it's supposed to do, it just works. I've tried many others, and the only one that I'd put up against it is an UP board, but for way more money, but it's Intel Atom based and'll run pretty much anything a PC will run including Windows, VMware, and Virtualbox if you'd like. However unless you're a seasoned Linux fiddler it's not something I'd recommend to someone unfamiliar. The Raspberry Pi is cheap, stable and has a community catering towards noobs. You can have a running system up for $50 and a huge support community to get you going in a day, and all the HATs (the Pi Expansion boards) just work. If you need a Linux box to do more than you can do on a Pi just run a VM. However if you're into tinkering and have a good grasp of Linux and don't care about HAT compatibility, or cost, or that it fits in one of the many many little cases available for the Pi and have to have it as a standalone tiny SBC, there is lots of options. Oh and for IoT Ubuntu offers zero advantages over Raspbian, it's actually a huge negative.