Need help deciding which car to replace

Hello there,
I recently bought an SUV to accommodate a growing family and now have to
decide which older car to replace -
a. 2006 Honda Accord w/ 126k miles - bought in 2008 - paid total incl tax-
$15600
b. 2011 Infiniti G37 w/ 51k miles - bought in 2014 - paid total incl tax -
$27000 -

I tried to put the G on the market, but found the best offer to be at 16.5k. Net
net I am making a 10.5k loss in 2 years after driving 16k which seemed pretty
bad for me. Then, I started wondering if I should sell the Accord instead since
it has already been at a high mileage. My only worry is the running cost of
the G and insurance which is much higher than the Accord. My SUV is an
Infinti too which will have higher maintenance costs so I wanted to keep the
other car running cheap. But, the fact that I am losing a lot of money on the G
makes me wonder if in the long run, I am better off keeping it and replace the
car for a longer period.

Any advice you provide will be very helpful. Thanks!