I have both and love them both. I would go with Bottega if you want something a bit more conservative that you could wear to work. It is a bit more classic as well. However, I TOTALLY disagree with people who say that Balenciaga is "out". It is a neo classic (has been around for over 5 years). there are knockoffs of every bag out there that is popular, including the Paddy, the Spy, the Bottegas, even Botkiers. It really annoys me when people call somethin "out". Don't let your life, style or fashion sense be dictated by people who pretend to have authority on trends. Have your own personal style and let that determine what YOU like. People who let others determine what is and what is not fashionable are really people who just lack individuality and style.
Just my two cents. Good luck with your decision.