I use RME gear but I've owned MOTU interfaces in the past and they're all solid, just choose what you want based on the feature set you need. Unless you'll be going DIN MIDI in a big way and need routing/filtering/etc (in which case I'd suggest the iConnectivity interfaces instead, for MIDI-specific concerns), if you only need one pair of I/O alongside a quality audio interface then take a close look at the Ultralite series - the AVB is a very flexible and expandable unit and makes a great starting point for a studio that might grow. They've all got one pair of DIN MIDI built in, no breakout or expander necessary. If you only want to add MIDI and are not concerned with the audio side of things, the microLite is a cheap and useful way to get simple, robust MIDI I/O to your computer. Their "Express" series add filtering and routing, but I haven't compared their offerings deeply to the iConnectivity stuff - the latter don't require custom drivers, though, so I tend to prefer them when you need to get more advanced.
Probably more information than you wanted, but hopefully it's helpful. Maybe some others here can chime in too, who use MOTU more than I do?