Why Yoko's instead of Conti's? Maybe because the Yokohama's are a known name.
Heres how they compare. According to the comparison the yoko's are only WR rated, and there 82 a piece. The conti are 81 and VR rated.
The conti's numbers are on the left and the yoko are on the right.
Continental
ContiExtremeContact
Blackwall
Size:205/55VR16
Yokohama
AVS ES100
Blackwall
Size:205/55WR16
PRICE $81 - $82
ROAD HAZARD PROGRAM
(price with four tires) N/A - $39.36
ESTIMATED AVAILABILITY In Stock - In Stock
PERFORMANCE
CATEGORY Ultra High Performance All-Season - Ultra High Performance Summer
SPEED RATING VR - WR
TREADLIFE WARRANTY None - None
WARRANTY RATING*
HANDLING RATING 8.10 - 8.40
DRY TRACTION 8.7 - 8.7
WET TRACTION 8.7 - 8
SNOW TRACTION 8 - N/A
RIDE COMFORT 8.4 - 7.8
NOISE COMFORT 8.3 - 7.6
WEAR 8.5 - 7.2
TREADWEAR RATING 400 - 280
TRACTION RATING A - AA
TEMPERATURE RATING A - A
Continental ContiExtremeContact
Yokohama AVS ES100