Tribbie or Robin? (F2P)

Help! Should I pull for Robin (I'm at guaranteed since I lost 50/50) or save up for Tribbie? I'm not caught up with Tribbie's current kit, so I'm not sure if she'll be worth pulling for in the long run.

Characters I plan to pull for in the future: - The Herta rerun - Considering Castorice/Aglaea - Ruan Mei rerun

Characters I have and frequently use:

• FUA team: Feixiao, Topaz, Sunday, Aventurine (My dmg is pretty ok with them already though)

• Break characters: Firefly, Boothill, HMC (since I'm not using RMC rn), Fugue, and Gallagher (I don't plan to replace him)

Other characters I've built but rarely use:

• (For certain game modes) DHIL/Qingque and Sparkle,

• (For PF) Serval, mini Herta, Himeko, Clara, Blade sometimes

• (General use) Bronya, Pela, Asta, Tingyun, Luocha

• I have all the 4 stars and standard characters as of now