I use 78L12 or similar voltage regulators in a few power supplies. I use them in their basic setup, see the picture:
This diagram is common for all 78xx and 78Lxx regulators. It says that output capacitor should be 100nF. I am able to obtain these 100nF capacitors either ceramic, or tantalum, or film for almost the same price (near to nothing) so I'd like to know which type of capacitor is the best for this particular case.
Note: I know that a tantalum cap is recommended for SMPS output, but 78xx isn't switched-mode.