At the last two posts, my lecture hall seating gives me a clear view of the professor. But I do stress that my lecturer has a mic that makes him sound as if he is everywhere.
The mic doesn't do that, the speakers the mic is connected to do. Where are those speakers? Above you in the ceiling?
The Snowball isn't a magical mic, it's just a somewhat directional condenser microphone. If you aim it away from the speakers in the ceiling, it will try to reject the sound coming from the speakers. So you need to aim the mic at the speakers.
Boundary mics don't need to be aimed, and they will use the surface of your desk to get some free acoustic gain. That's a clever trick the Snowball can't do, at least very well.
If you told me you only wanted to podcasts, I'd say, yeah, get the Snowball. The boundary mics would be terrible for the typical podcast. The Snowball will work OK for recording your class, but it isn't a magic bullet that makes everything sound wonderful, you still need to think about how to position it.
The classes that I attend never makes any noise and is dead silence.
I can't say I really believe that. Your mind is an extremely powerful processor that filters out environmental noise, but that trick only works when you are there. When you hear the playback, you'll hear all kinds of noises you didn't hear live.
I want the SnowBall to hopefully record my professors as if he was up close to the microphone. Of course to a degree, it won't be exact. It seems to me that it can either do just fine recording it, or it would be quiet recording it. I don't really remember how loud his speaker is, but I feel that I can hear him exactly as loud, ANYWHERE in the room, due to the speakers. Not to mention I always sit in front.
Again, this is a function of your brain's internal filter and not so much what you will get in a recording. You won't get the same sound as if you close-miced the professor with the Snowball. Laws of physics prevent that; there are several phenomena at play. You can get a perfectly good recording though.
EDIT: Most importantly maybe this question would be more easier to answer. How can the SnowBall record voice when it is far away, yet at still very audible?
It can't. In a free field, reflection-free environment, sound will lose intensity with the square of distance. Reality inside a classroom is a bit more complicated, but bottom line is that the nature of the sound will change the further you get from the source. Of course, your source is the speaker over your head and not the professor, so it's not so bad.
If the classroom was done well acoustically. If not, there will be lots of competing signals and annoying reflections from all of the other speakers in the room. So find a seat that is as directly under a speaker as possible.
The other thing that happens as sound intensity from the source diminishes is that noise from other sources is still pretty much all around you. So the signal to noise ratio degrades, which means it's harder to hear prof over the guy next to you popping his bubblegum.
Some mics trying to overcome that limitation with very narrow pickup patterns ("shotgun" mics). They don't pick up sound any better in front than other microphones, they are just really good at rejecting noise from the sides. The result is improved signal to noise ratio. The Snowball, however, is a somewhat but not very directional microphone, so it's nowhere near as good as a shotgun mic would be for that purpose.
Again, if there is a speaker above your head, this is not a huge problem. Aim your Snowball at the speaker.