I interviewed to change brokerages a couple of years ago and talked to both. Since you are brand new you have different needs than a lot of brokers - you need both training and mentorship. KW yes offers lot of training and is known for that. A lot of new brokers start there. ExP has the cloud based brokerage. In Oregon they have limited Principal Brokers, so if you have a question, need help, etc you have to go to the person who recruited you - who may not have much more experience than you. That concerned me when I talked to them.
Talk to lots of brokerages and understand their models, how they pay commissions, how they do or don't train you and if they provide mentorship. Expect to go 6 months without a paycheck but paying lots of expenses upfront for dues, signs, lockboxes, marketing, training, etc. So be prepared for that. Run it like your business, work hard and ask for help. Let everyone you know, and I mean everyone, that you're in real estate - your mom, your childhood babysitter, your hairdresser, your neighbors - that's how you generate leads. This whole business is based on lead generation - you generating your own leads. No one will hand you business. You go out and hunt for it.