RKR is probably a better bet in PK, i've kept a defender 110 and it was not bad either except the people in the back were always miserable.
if you are comparing a cabrio 90 to an RKR i'd still say the RKR is better if you can find a decent one. honestly both are amazing vehicles but having owned a defender and also sat in my friends RKR i'd go for an RKR next.