Looking to get the hard sear, but I'm not sure if I should spend the extra and get the DCAEK?

It'll be going on my MP9c which is my conceal carry...

I believe the hard sear will lower the trigger to about 4.5-5lbs which I'm happy with on a EDC

from what I can tell the DCAEK is the same thing except the trigger is at about 5.5lbs for people that aren't comfortable with 4.5-5 lbs... is there any other benefit to it?

one thing I don't like on my MP9c is a rather heavy 2nd stage. when the slack is gone it gets pretty heavy...

so I'm looking for advice on if I should only get the hard sear or DCAEK?

There are some other things I see on their website like the USB so i'm little lost as to what I need

thanks!