Hiya guys! Recently took my next step on the journey of Mechanicus, and brought myself the Combat Patrol, as well as an Enginseer, a Technoarchelogist and 2x boxes of Kataphron Battle Servitors, due to how much I'm loving the Kataphron Breachers I got from the Elimination Maniple box that my Mother got me to help start my Mechanicus Army. I now have two questions that I've been meaning to ask for a little bit!

1. Should I build the two boxes of Kataphrons as Destroyers or also build them as Breachers? I heard that Destroyers are a bit worst then Breachers and I'm on the fence whether or not to build them as Destroyers as of this moment in time.
2. What should I look at aiming for after I build and paint what I currently have? I'll provide a list of what I currently have unit wise and what I'm planning on building from the boxes I got, but I'm a very uncertain person and any advice would be amazing to have at this time in my journey of building the army.

Any responses would be very helpful!

Units I currently have:
Characters:
1x Belisarius Cawl
1x Cybernetica Datasmith
1x Tech-Priest Enginseer (to be built)
1x Tech-Priest Manipulus (to be built)
1x Technoarcheologist (to be built)

Other Units:
10x Skitarii Rangers
10x Skitarii Vanguard (to be built)
2x Kastelan Robots
6x Kataphron Breachers
6x Kataphrons (to be built, Destroyers or Breachers)
5x Pteraxii (to be built, probably Sterylizors?)
x3 Serberys Raiders (to be built)