Alcohol is more dangerous
When you're high you don't really do much, you just kind of hangout and exist. When you're drunk you're overly confident, sometimes aggressive, and make a ton of bad decisions. And you can also drink enough to kill yourself with alcohol poisoning.
So alcohol is way more dangerous, and has worse side effects.
However, you can casually drink alcohol and not get drunk. Not sure if you can casually get a 'small' high, or what the point of that would even be. I genuinely like the taste of beer, and drink it in moderation.