I'll try to add Painter's Hitch to my repertoire, I can see how it can come handy.
And yes, the selection really depends on one's use case. I think that Trucker Hitch was the most life changing for me. Both for securing items in the car but also as a more versatile replacement for taut line hitch when staking down guylines to the ground (Andrew Skurka has a good demonstration of this use case).
Though for your use case taut line is probably best as it's easier to adjust and you probably aren't trying to optimize for minimal line length or weird anchor points)
And yes, the selection really depends on one's use case. I think that Trucker Hitch was the most life changing for me. Both for securing items in the car but also as a more versatile replacement for taut line hitch when staking down guylines to the ground (Andrew Skurka has a good demonstration of this use case). Though for your use case taut line is probably best as it's easier to adjust and you probably aren't trying to optimize for minimal line length or weird anchor points)