I'm sure you will. I also mentioned club but youve chosen to ignore that. That does not change the fact you walked in, gave no details , except someone wants to give me a RR for my LC and 15k, is it worth trading . How should we know?
You are more likely to know the market price in your area. You are the only one who knows for sure if you think 'it's worth the trade'. You're the only one who knows whether you prefer the LC or the RR for looks, comfort, finance, what youre using it for, and probably a hundred other personal choices.
Asking specific questions is one thing., e.g. which gearbox seems to have less issues, should I buy a RR with a known fault, are 22" low profiles a good idea, any idea what the vibration through the floor is,etc. As I already said, asking a bunch of strangers, for advice on which car you should drive is ludicrous , anyone saying otherwise is as ludicrous as the question itself. On here , the majority will say RR, (with the caveat, they break down all the time but we love them), go on a Toyota site, the majority will say LC.
In case you didnt get it my last analogy, asking strangers, which car you should buy, is akin to asking strangers which underwear(or lack of) is best for you. That's how tailored to the individual it is.