need line info

I just got back into fishing about 1 1/2 ago after a 10 year absence. All
the line back then was pretty well all mono except for a few of the newer
lines I seen coming out. Now with mono, super mono, fireline, braid and
florocarbons how do you all determine what and when to use them and whether
to use them on baitcasters or spinning. I have all xps rods and Shimano
reels beside some panfish outfits. I read one article online that this pro
hated floro on baitcasters and only uses it on spinning and another was the
oposite. I tried fireline and braid on a baitcaster but it would either snap
at the knot or come untied. I have P-line floro 12 lb. on a spinning outfit
but that stuff coils bad.
Any and all info would be greatly appreciated.
Mike

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JESUS IS LORD!