Logbook Pro. It's fairly intuitive and you can create customized (time, counter, text and yes/no cells) columns such as offshore time, hoist sequences etc. You can also set up currency items or expiry dates for your medical. You can pull all kinds of reports sorted by aircraft type, category or class. You can view and print currency status and history reports, Jeppesen Style and other styles of flight logs. There is a versions for almost any kind of device available on the market and you can synchronize data between those and/or a cloud. Make sure you save a backup on a regular basis regardless of which program you are using. Keep multiple copies of that file on your laptop or external hard drive, email the backup file to yourself or sign up to their cloud sync feature! Nothing sucks more than loosing all your data an a stolen laptop or a crashed hard drive.