Just sharing 2 experiences I had with Carsome and MyTukar:

1. 2001 Toyota Camry, went for inspection at both places, got the same offer at both places for RM7k. Tried luck to put online bidding, but didn't receive any bids so in the end just sold to Carsome for their RM7k offer.

2. 2004 Toyota Vios, also went for inspection at both places.

Carsome offered RM13k, didn't accept offer.

MyTukar had some issues and could not complete the inspection so did not get an offer, but few hours later I got notification that the car had somehow went up for bidding and had received a bid offer for RM15.4k.
In the end did not accept the offer as sold it to someone else for RM16k.