I always start with Ranger because traversing rain forests takes forever. After that I'm always tempted to take the Guerilla and Ambush route because rangers with these two upgrades sound like a lot of run to play around with (and the new spec ops upgrade coming in Rise and Fall could make this even truer). Unfortunately, I usually find myself filling out the bottom portion of the tech tree a bit later than I'd like, so rangers don't wind up with much to do by the time I'm ready to upgrade my scouts. For this reason I find myself defaulting to Sentry/Spyglass just for the immediate and guaranteed utility these upgrades bring to the table. So I'm wondering how you guys play things when it comes to upgrades for your scouts. Do you find the eventual payoff from the Guerilla and Ambush upgrades to be worth the long term investment? Or do you just take the less interesting but immediately useful Sentry/Spyglass route?