"Not really," Giuseppe replied. "Most Warlocks are still viewed with distrust; there's a big assumption of prior wrongdoing since so many of them showed up out of the woodwork after legalization. The rise of full-fledged Warlock Guilds hasn't helped any. Raleigh largely got a pass since she actually has something resembling a harmless history and shares a Guild with what the uneducated think is an angel. Angels aligned with death are too violent to hide what they are, and the rest are generally associated with protection, divine favor, that sort of thing."
This is pretty big point in favor of Angel's Eye. 3/4th of Blake's mana capacity is
Black, so it's very helpful to have a moral(ish) warlock to learn from, and a guardian psuedo-angel to convince people she's still on the path of righteousness.
Overall, I'd say:
1) Angel's Eye (Small and New)
+ Helps maintain a good reputation while still using warlock abilities
+ Between the warlock and the not-angel, can definitely give advice on the dream-entities
+ A powerful, partially divine ally to copy abilities from, and call upon in a fight
+ Small and tight-knit, so sharing info about Blake's Planeswalker abilities is simpler and less risky
- Least variety of magic
- Few potential summon bonds, and most are likely to be weak
2) Liquid Horizon (Archeology & Magic Development)
+ Synergizes well with ruin exploration, and Blake likely has far more talent with learning Lost Magic than most
+ Easy method to impress the Guildmaster; Blake can almost certainly learn his signature scrying spell with Blue mana
+ Multiple "ludicrously powerful" wizards to form summon bonds with
- Lost Magic tends to be lost for a reason; it usually has some kind of drawback
-+ They might be suspicious of a naturally-talented warlock that wants to learn their secrets. Alternatively, some members may overlook this and be super excited to teach a magical prodigy. Results may vary.
3) Lion's Pride (Large & General)
+ Largest variety of magic
+ Niche for just about everything; Lost Magic, ruin-delving, artificers, combat-junkies, wannabe-heroes, etc.
+ Probably the second largest pool of OP wizards for summon bonds, after Liquid Horizon
- Blake's talent for Warlock magic will likely attract suspicion from some, potentially some harassment
- It could take quite some time to attract the attention of the powerful wizards in the Guild
4) Sylph's Symphony (Artifact Creation)
+ At high levels, artifice can be very powerful
- Most of the basics can be learned from a small course without joining the Guild
- Blake's only 1/4 Blue, so specializing in artifice would mean ignoring much of her skillset, unless she wants to get into the business of selling cursed items
- The best artifacts can be found in old ruins, or the MGLN plane