B!Lucina or Fjorm for Ayra?

Hi guys!

I'm new here, can I just let this link here or should I copy every stat and the explanation of the build? Well, I'll let the link for a brief explanation and i'll add some thoughts here.

https://fireemblem.gamepress.gg/user-hero/phcapelli/ayra
Note: Those stats are with Summoner's Support.

Right now she's paired with a B!Lucina. My B!Lucina is with her Legendary Weapon, Drive Spd 2 and Spur Def 2 Sacred Seal. It means that Ayra is now with +2 all stats, +3 atk, +6 spd and +3 def. Her stats buffed will be like:
HP 43
ATK 51 ~ 56(+3 from legendary weapon, +2 from support)
SPD 46 ~ 54 (+3 from legendary weapon, +3 from drive spd, +2 support)
DEF 33 ~ 38 (+3 from Spur Def, +2 support)
RES 23 ~ 25 (+2 support)
Note: All buffs are able to support Ayra (+1 all stats from support) 2 spaces away, except +3 Def from Spur Def.

I'm thinking in making Fjorm her support, who has Atk/Def Bond 3, Spur Res 3, Spur Spd 3 Sacred Seal aaaand buff Ayra with Water Blessing. This means that Ayra now has +2 all stats, +3HP, +5 Atk, +5 def, +7 spd. Her stats will be:
HP 43 ~ 46 (+3 Water Blessing)
ATK 51 ~ 58 (+5 Atk/Def Bond, +2 support)
SPD 46 ~ 55 (+3 Water Blessing, +4 Spur Spd, +2 support)
DEF 33 ~ 40 (+5 Atk/Def Bond, +2 support)
RES 23 ~ 29 (+4 Spur Res, +2 support)

Clearly, Fjorm has a better role when it comes to buffing allies. Despite the difference between the buffs being small, except for RES, I don’t know if it’s worth. Fjorm can do a huge buff in literally all stats (freakin’ 9 Spd), but only if Ayra is next to her. B!Lucina has the ability to buff 2 spaces away, except for DEF and 1 point of support for each stat.

Also, in close combat, B!Lucina is virtually better, with more ATK and SPD (and +4 ATK/DEF with Sturdy Blow). On the other hand, Fjorm has the same DEF (in enemy phase), better RES and excels in dealing with B!Lucina greatest problem: mages. And has a DC built in weapon.

Any thoughts? Both have a great synergy with almost every team, fulfilling their duty and buffing everyone, but who might be better?