I prefer fast Quick Attacks for dodging, so IMO on ofense ZH > Confusion.
Your Espeon with FS will be a better Psychic attacker than ur Eggy cuz:
- have higher base attack;
- FS do more damage than Psychic;
- Eggy have more weaknesses so Espeon is more useful than a pure Psychic Exeggutor.
I would max out your Espeon for ofense, not for defense. If you want a defender i would go with Exeggutor cuz of his HP and Psychic is harder to dodge than FS but tbh i wouldnt power any of them for defense, just Espeon for attacking.