The most important piece of gear I have are my ears and experience. Over the last eight years I have acquired a lot of wisdom on where songs are and where they need to go. This then dictates what gear to use or more importantly what not to use.
I mainly work with analog gear. I do finishing touches with digital.
I work in a room that is flat, phase, and time aligned so I hear your music correctly.
Lynx Hilo Mastering Grade Convertors
Custom cables from Mogami, Belden, and Canare
Monitoring: Barefoot and Genelec
Metering: Dorrough Loudness Monitor and Bettermaker Digital Meters
Some of the pieces of outboard gear I have been into lately, Bettermaker Mastering Limiter, Overstayer MAS, STAM SA4000 (SSL G COMP), Vintage Tube Saturator, Black Lion AM/CHA 1 Mastering EQ with Vintage Cinemag transformers, Vintage Yamaha EQ, Vintage Loft Limiter, Aphex Exciter, and the Elysia Compressor.
Every project is different. I pick gear based on what will serve the project the best. I also can rent any piece of gear you could want as I live five minutes from Black Bird Gear Rentals if there is something specific you want.