Rod and Reels... What does it all mean?

Hey guys, I'm looking to buy some new gear and am literally having information overload and anxiety reading reviews, browsing countless forums, and watching youtube videos.

It seems like the more I read the companies description the more everything starts to sound the same
"Superior performance"
"Unmatched durability"
"Built to last"
"Handles the toughest of blue water"
"Smoothest drag"
"Outstanding cast assist magnetic system"

These seem to be posted on every manuf. website for every reel they have.

Here's my question, and please be patient with me =)

When I see you guys out, typically I'll see anywhere from 1-8 Rods with different reels on them. What is it about each rod the sets it aside from another to serve its specific purpose? What are the real life scenario traits found in reels that identify its specific function.

For instance, what makes an Iron throwing reel better than another?
Why couldn't the same said reel be used to flyline bait?
Visa versa?
Does it all come down to a matter of preference? combined with over the years experience setting certain qualities above the rest?

For instance. I've sold off my spinning reels, and looking at bait casters.
One of my top of list choices is an Abu Garcia Alphamar 20.

On paper, and through youtube reviews, online reviews and so on, this reel is held with high regard. But how can I know from the on paper stats if its a good Iron throwing reel, a good live lining YT reel or a good Halibut reel? Could I realistically outfit 4 different rods with the same reel and have the same results?

I hope this is all starting to become a little clear of what I'm asking. Hopefully if we gather enough information we can make it a FAQ reels thread for people like me who have similar questions?


Thanks guys and tight lines.

Neill