Should i buy paperbacks or omnibuses
So I'm kinda new to comics, I've watched the flash tv show and I'm kinda into the comics now and wanna know more of his story.
I've searched online and i see many ppl praise Geoff's run and Waid's run,and i noticed ppl said buying omnibuses are the best choice,but i found out there's paperbacks and omnibuses. I do know how they work but i don't know do they have same and as much content,for example let's say i wanna buy Geoff's run, there's 6 paperbacks and 3 omnibuses,do they share the same amount of story? If they do,which one is better (as in convenient to carry around or read or simply easier to find or saves more money)
Also what runs you think i should pick up as a new fan? Should i buy the silver ages or the newer stories?
Here's what i know:
Flashpoint
Crisis on infinite earths
Death of iris west
New 52 flash
Flash rebirth