I believe that with the recent changes to Seraphine's E, it is worth maxing first for a catcher playstyle. Points in E now buff the slow/root/stun duration, lasting 1.5 sec at max rank. Combined with Rylais, this gives a long lasting hard root that goes through enemies, similar to Zyra's E. The high base damage on the ability also makes it a strong poking tool in lane. This build allows Seraphine to function as a mid-high damage catcher with high utility.

Strengths:

[*] Versatile; Has good mix of utility and damage and fits well with any lane partner/team comp. Can lean into being more of an AP damage dealer or an enchanter depending on what the team needs.
[*] AOE Shielding / Healing; AOE shielding is rare in league and AOE healing is even rarer.
[*] All damage is AOE
[*] Great teamfighter
[*] Very good range
[*] Strong Ultimate
[*] Scales well, Useful from behind
[*] Easy to play

Weaknesses:

[*] Extremely squishy, limited mobility
[*] Relatively weak early game
[*] Spells are slow and telegraphed; Weak against very mobile enemies
[*] Long cooldowns, especially R and W
[*] Mana hungry
[*] Can be difficult to get full use out of R