It's more preference than anything. I would stay away from Hybrid HDD's though. I've dealt with both Samsung and Crucial (Micron) for DRAM related issues:

Crucial - This is actually Micron. They're based, manufactured, and operated out of Boise, ID. They are more expensive than most, but you're buying American for what it's worth (plus Boise is my stomping ground)

Samsung - Their customer support is AMAZING. Any time I've had an issue with one of their products I would actually get connected with an Applications Engineer (I'd do my own TS and would likely just need an RMA).

Both companies have I/O speeds around the same clock and their MTBF are about the same. It all comes down to preference (and the better deal). Can't say a whole lot to Kensington. I've never used them but I have heard negative things.