Which brokerages are the best for investor-agents in Portland OR?

[Account Closed]

I'm getting my license soon and ultimately want to represent other people selling and buying residential and/or commercial multifamily properties (yep, those are different animals), as well as represent myself on my own deals.  

My significant other is a principal broker with Keller-Williams representing mostly buyers of SFRs; he would like me to partner with him as a team, but I also want to find the best fit for my goals and personality.  KW is investor-agent friendly, but its desk fees + commission splits are "expensive" and I wonder whether the high-profile brand is overrated in terms of the actual value it delivers to its agents? (???)

I'm sure this question has been posed before, but I don't always have much luck with search results on BP.  What are your thoughts about the different brokerages in and around Portland for investor-agents (who are starting out)?  

For example, someone told me yesterday that Windermere isn't great for investor-agents, though he didn't say why.  As a designer, I really like M Realty's marketing, but I know nothing about how receptive they are to investor-agents.  I've learned some good things about Summa from @Randy Johnston and have noticed many investor-agents are with Premier.  But there are a ton of brokerages out there that I know nothing about.  What's your experience with them?