Help! Where to start???
Actually I have always found inboards easier to diagnose and to work on, especially in an emergency. This is one of those subjects where there is a real diversity of opinion. If you are handy and expect to do your own work, then inboards are way more reliable, the parts last much longer and regular maintenance tasks are less of a chore.
If you need to count on others to work on your engine then it is nice to be able to drop the engine off at a repair place and have them fix it.