If you have friends at both ask them their advice. Don’t ask us. 99.999% of the folks here haven’t worked for United. I don’t think you’ll be in the top 10-15% at spirit by age 50 FYI and probably far far from it. Also, United doesn’t require 1,000 TPIC. Folks have left spirit for United and regretted it. Folks have left spirit for United and never looked back. No one has voluntarily left United for spirit.