[x] Join the assault on Und-Uzgar
Combat in the other options is likely; here it's certain. As our purpose here is to contribute to the campaign and gain dwarf favor, the optimal choice for us is to be in the thick of it. More than that, Mathilde is great for assaults; she moves quickly, can infiltrate due to stealth options, can counter enemy spellcasters, and can cause Terror in enemy defensive lines. Many of those traits are nowhere near as good on the defensive, whereas when acting offensively on her own terms she has the chance to truly shine.
I'm uncertain if we should bring any of the journeymen; this is dangerous business, more so than either other contribution option. Still... if I were to pick someone, it would probably be Maximilian.
That's not because I want him alongside Mathilde- I don't, as that would get him killed- but because he needs the Dwarf Favor to accomplish his own objectives and he's not getting it by sitting in a well-protected camp. Joining an assault is quite likely to bring him some, though, particularly if he manages a star turn. With Dispel on his spell list he'll be of use countering any enemy magics, and with both Aethyric Armour and Guard of Steel on his list as well he's reasonably well-protected against mundane threats. Silver Arrows of Arha means that even if he's not needed for countering enemy magic, he can be of use as a capable ranged unit; there are better ranged attack spells but it's quite respectable and if he can cast Enchant Item then he has no miscast chance on Silver Arrows under these mechanics so he shouldn't blow himself up and make us all look bad.
[x] Marshal Titus Muggins
I want to talk to everyone left on the Council, but the halfling is our war buddy from back in Sylvania and it's a shame he's been left this long.