Alembic vs Warwick
I knew that I would be asked this. For the music I play, I can get the tonalities that I need with either bass, so they are equivalent in that sense. Of course, the differences in the two basses' architectures (e.g., NT vs BO; pickups; preamp, string, wood) means that different settings are needed to achieve the same sounds. For example, with the Alembic, I need to make a somewhat deeper "smile" on the EQ to achieve the deep/sparkly slap sound.
I have to do more A/B comparisons before I can post more detailed answers.
Non-acoustical differences: The Alembic Essence is head-stock heavy whereas the Thumb is better balanced, so with the Thumb I don't need to hold up the neck. (Thumperton, the Europa may be better balanced than the Essence.) Also, the string action seems springier on the Warwick -- I suspect that this is due to the scale differences -- 34" (Thumb) vs 35" (Essence) and possibly, the string guages -- Ken Smith Rock-Master Lights on Essence and unknown make/guage on Thumb (previous owner didn't remember).
I'd hate to have to choose between the two basses. Of course because the Thumb is a 6-string and the Essence is a 5-string, the Warwick has a wider range.
Thank you all for your comments. As I am new to the Warwick family, please give me any pointers you have on these wonderful instruments.
Also, I re-iterate that Oliver Dominguez is an awesome moderator and Warwick rep. I've asked him so many newbie questions and he has always replied quickly, precisely, and attentively. Give him a pay raise!