Is a lead-acid jump box still worth buying over a lithium one?

For most occasional drivers a modern lithium pack is smaller and lighter, but lead-acid jump boxes still dominate in shop and fleet contexts. Across specialist mechanic communities the consensus is that traditional AGM/lead-acid units deliver longer sustained cranking on dead or near-dead batteries and tolerate being left in hot or cold vehicles better than lithium chemistry, at the cost of size and weight.