If memory serves, both options (Silver Princess and Sunless Citadel) should be fine for eventually romancing Chaarna. Just that Chaarna won't join you if you do the Sunless Citadel. I don't think the romance has even been written yet, but I could be wrong. Haven't had time to play with the latest patch installed.
I'm kind of partial to the NPCs found in the Silver Princess route, though.
Thanks for the quick answer
So I suppose I'll be able to meet Chaarna later in the game if I choose the Citadel. Is the "Silver Princess" thing still available after the Citadel?
I tried playing CA a few months ago but I didn't get enough time to get far in the game. Since I'm now a little less busy, I've reinstalled it (version 0.44).
What's already different is Chaarna (a NPC which was not in the previous version I played) asking you to come with her instead of doing the first main quest (well that's what I've understood). If I accept, can I still make that quest with her in the party or am I supposed to refuse her suggestion?
I intend to make a romance with Chaarna so I don't want to mess it up right from the beginning.