Lithium batteries offer more bang for your dollar compared to lead-acid car battery counter-parts. Lead acid batteries may be more affordable on average, the following batteries offer a longer life, can be discharged to a lower level without incurring damage and offer higher amp hours.
My solar system consists of 2 lead acid car batteries, simply because of affordability and my needs. A lithium battery can be drained to 30% capacity and the battery will not incur damage where as a lead acid battery can become damaged when battery is discharged less than 50%.