Which one is more interesting?
What is the difference between the two?
More law resources on TSR
Law is very broad. It looks at criminal law as well as constitutional law (this area of law is called public and concerns the individual and the state). It looks at contract, tort, land, equity, insurance, shipping, company (this area of law is called private and concerns individuals only). A law degree touches slightly on criminal law -- beyond the mandatory criminal law module every qualifying law degree has to contain, there are few other criminal modules (law of evidence is one of the few examples).
If you like studying crime, do criminology. If you like studying law, do a law degree.