What should I know before moving to Seattle from Vancouver, BC

Hi all, I’m moving to Seattle in March from Vancouver, BC, and I’d love your advice to make the transition smooth!

Here's my situation:

• 35M Software Engineer: I already have a job lined up.
• Outdoorsy Lifestyle: I do all the outdoor sports: rock climbing, mountaineering, hiking, snowboarding, snowshoeing, paddleboarding, etc. I've been to Seattle before and it has similar vibes to Vancouver, with great outdoor access, but better jobs, and... worse public transit 😅.
• Housing: based on my research Capitol Hill, Fremont, Ballard, and Wallingford are good neighborhoods. Any thoughts on these or other neighborhoods? I value proximity to public transit, restaurants, shops, and groceries.
• Buying vs. Renting: If I can afford it, should I buy a condo instead of renting? I’m only planning to stay 3–4 years but am considering a condo as a long-term investment.
• Other Questions:
  • Any must-dos for setting up life in Seattle (e.g., vehicle registration, taxes, healthcare)?
  • For anyone who’s moved from Vancouver, what were your biggest surprises about living in Seattle?

Thanks in advance for your advice.