Xenophile is easier, it offers more tools to level the field if you're behind and gives better returns overall. Xenophobe is funner, it gives you tools to leap forward much more quickly but starts dropping off.
Hmmm, think I'll go with phile for first Utopia run, leave phobe for a future game.
Ok, cards on the table. Which is your preferred ethic and why? Must say I'd naturally lean towards xenophile but xenophobe does have some interesting mechanics. I'll almost certainly play both several times over, but was just interested in people's thoughts on this particular dichotomy - especially in light of Utopia/Banks.
Xenophile requires friendly neighbors versus xenophobe is always useful with the bonus to border range and influence gain.
Someone forgetting that the Blorg way is also available to xenophile. Who can say no to friend ships ?