Sharing my experience selling a 7 year old D segment sedan. Carsome quoted 63K.

Went to MyTukar, quoted 58K. A bit pissed with the low price so rejected the bidding, but they did it anyway, next day someone bidded at 66k, couldn't sell as new car not ready.

2 weeks later new car ready, inspect again. And quoted 60K, bidding next day got 71K offer.

So if you don't agree with initial price, do it again later.

I'd say, just book an appointment for both of them at the same day or 1 day difference;
Go for MyTukar first as on my case, MyTukar gave their offer in the next 24 hours while Carsome gave an offer right after inspection.

Then you can use that pricing for a bargaining chip 

2019 X70

Carsome offer higher price than Carro