Squeaks prefers the small microfibre cloths, personally I find them awful, I prefer the larger ones, they last so much longer through the day.
I've used Unger in the past, but I now use the 'cleantech' own brand ones, they are no different to the Unger ones, merely a little cheaper to buy.
As I understand it, places like Macro have Microfibre cloths that are way cheaper than those we get from dedicated suppliers, I can't comment on them personally as I've never had one to use or even seen one, but I'm told they are good.
Ian