NDBs are still possible to on the exam (see the Practical Test Standards
here). You are expected to be familiar with all equipment in the aircraft. If there's an ADF or RMI then you can get an NDB approach. 2 non-precision approaches are expected on the exam. Some people just make the ADF in-op so they don't have to deal with a piece of equipment which is being phased out.
Generally, you will most likely find something easier if you're used to it. I did my IR conversion from FAA to JAA and found the subtle differences between the two systems very large, annoying and irrelevant but that's because I was used to the FAA system.
An FAA IR is something you can attain quickly and generally the ATC system in the US allows for easier flying (at least compared to the UK; with night flying, few to none slot restrictions, easier access to airspace, etc.). Of course, weather and aircraft permitting.