How to catch domain name?

Hey guys

Im new here.

I wondering does anyone know diference between catching domain on dropcatch or catched?

Example,
I follow some high DA domain name on experied domains net. which is pending for delete, and I backorder that domain on catched. But almost every time I missed domain and some other pick that domain without auction.
Do you know why?
Is dropcatch faster than catched service or must be some other way how to first pick domain.

Thanks for help WordPress ...