Adding +5 stats to quiver
The infusions you get from Laurels only give +4 to a stat and give no agony resistance. The infusions you craft give +5 to the stat and the +5 AR.
If it’s worth it or not is your call.
The 250 ectos thing only gives +5 AR to the backpiece itself (not the infusion slot). If you don’t plan on going through fractals, this isn’t worth it.