Either one will make a fine ride. Chances are the CRF will fit your physical size better ( not that the YZF can't be opened up ). The YZF is a liitle more reliable ( depending on how hard you ride this may be a non-issue ). IMHO the CRF suspension is better than the YZF, and the motor on the YZF is better. I've had both and I honestly think the fit and finish on the CRF is better, but not much. Like I said either will make a fine ride - if motor performance is at the top of your list, go blue. If the chasis and handling is at the top of your list go red.
Hope this helps !