DMR Build Questions

Hi everyone. I am new to the community and this is my first thread. I have recently stepped into the SDM role for my team. I am starting a DMR build using my Echo1 Troy TRX 13. So far I have the inner, a suppressor to cover the new inner, and a decent optic.
I can really use some advice from you guys on what to upgrade, what brand you have found to be reliable from experience, and what accessories are helpful to run with. Do I go with a high torque motor with torque gears or do I use speed gears?
Thanks in advance for any information and advise you can give me to aid in the successful completion of my build..