I use all of them, just depends of what I am loading at the time.
It's all up to you.
I only bought the electronic nightmare because I just wanted it. It is a very cool unit and works well for me.
My friend who reloads also used an OLD Redding beam scale what would NEVER balance to zero. It was it's design to do so, you had to figure out the actual weight by taking the amount it went over zero to the amount it went under zero ( The swing ) and divide that to find your weight.
And thats with NO drafts in the room...It's very sensitive..!!
It was NOT for me...!!!
I'll take my rcbs 10-10 scale anytime

Don2