Replacement tires for MZ Silverstar with Velorex 562

Members: It is time for me to replace the tires on my 94 MZ Silverstar Gespann. I doubt, if these are the original tires. The rig shows 18k miles on the odometer The rig is currently running 100/90x16 Kenda K671 on the front and sidecar. The rear is 130/90x15 K671, I know an odd size. I am trying to decide if I should keep the Kendas or go with the Shinkos or perhaps another brand. Any opinions on either of these two brands or others? I will be replacing all three.

Cheers Clark Bertram