It depends on what your requirements and budget are. Test drive both, they will feel different. The TL is heavier, quieter and had a different feel than the ILX does. Size is also a factor with the TL being larger. If you plan on long trips with the car, the TL will be better. More commute, local/city driving, then the ILX might be a better choice. If you want the smoothness of a 6 cyl - then TL is your option, whereas if the 4 is good for you, then ILX.
I would highly recommend taking both out for a good test drive and consider what you will be using the car the most for.