Hello Mayan Dreamer,
both ports, Tenerife with a wonderful tour over this special Canarian Island and Lisboa, beautiful city, are great.
I don`t know the Splendour, but I love the Brilliance and her sistership Jewel.
Normally I also prefer longer cruises, but the ship is also important.
I´m in the same situation right know. We have different offers for the transatlantic tour in november and at the moment my favorite is the Millenium, but also shorter than other cruises.