Having had a QR wheel on a single speed slip on some grunty uphills I concur that for single speed or track/fixie riding your ideal path is to stick with nutted axles. They clamp with more pressure and less operator effort. I was more than happy to change from a QR axle to a solid with nuts.

The trick is the axle nut wrench you need to carry along with your tire levers and spare tube. The trick setup is to get a cheapie dollar bin 15mm box end wrench and using a grinder or abrasive cutoff saw cut the wrench down to about 3 inches long and carry this short box end axle nut wrench in your seat bag or wherever you store your spare tube and other bits.