It very much depends on wheels, how low you are, tyre sizes etc.
I've never had a need for shortened drop links when running coilovers.
There are lots out there and they are all much of a muchness to be honest. Honestly there is little difference in ride quality between the majority of coilovers and certainly not the price difference.
Compare JOMs to APs they look identical in design, the AP is slightly firmer but has better compression and rebound settings so the car doesn't bounce around over undulating dips
If you just want to go low buy JOMs or FKs.. if you want to improve your handling look at some Apex RDXs or APs or something like that.