In 5 years, a car driven to-and-from somewhere 6 days a week will see 3650 charge/discharge cycles. A decent LiFePO4 battery will last 5000 cycles, much longer. So at near-equal cost the advantage is clearly for the LiFePO4 battery. Even if you get 7 years life from your 'car' battery (which not too many people do) you still come out ahead for not carrying around it's weight versus the lightness of the LiFePO4 . The only parameters where any L/A battery wins is working temperature range, initial cost, and more rapid charging. Since the cost advantage is lost over time, and the LiFePO4 barttery is in the climate-controlled part of the car where operating temps should always be OK, that leaves faster charging as the only thing to recommend it.
And further, as that 'car' battery wears, your parking time becomes shorter and shorter due to the wear characteristics of L/A batteries. You'll have about half of the original recording time for the last 1/4 of that batteries service life. But with LiFePO4 you'll lose very little recording time till it's last 8 or so months of life, and then you'll never lose more than 20%.
The world is full of armchair experts, so everyone should do their own research. If you want to understand LiFePO4 and why it's superior, one place worth looking is
DIY Solar Power with Will Prowse on YouTube, and on his website. He has the knowledge, testing equipment, experience, and has run the numbers and tested this stuff. What he says checks out against all the others I've found with expertise in this field. Once you do look into this you'll find everything I've said is true, and then you'll make the right choice on your own.
Phil