pinching a tube is more technique than anything to do with the specific tube. Use lube (soapy water, WD40, Ruglide, etc.) and partially inflate the tube. Make sure your tire irons don't have any sharp edges and be careful.
As far as tube selection goes, I use real rubber tubes which are less likely to split; Bridgestone HD are my favorites and I tend to stick with premium brands; michelin, bridgestone, pirelli, etc.
I used to use UHD tubes such as the ones from Moose racing but they are very heavy, take up a ton of space (for spares) and are overkill for a KLR.