Dennis,
I use them all --- EXCEPT I rarely, if ever, weight any wet flies... I like to fish wet flies high in the water column... the exception to this rule is the Carey Special, which I use in ponds for brook trout, so I do use lead under those peacock bodies..
I like some beadheads where I think
FLASH is important... I like to think a shiny beadhead sparkles underwater creating the illusion of life, simulating air bubbles and breathing... I also use beadheads for tiny, 16-20 size nymphs, where I might be concerned about body bulk/thickness... some of these I fish off/under a dry fly as a dropper some 3"-6" below... most deep running nymphs I use lead on... not only lead, but than I wrap floss along the lead and coat the combo with head cement so the lead won't oxidize through the body after being used one or twice and having gotten wet... I guess if one doesn't fish a fly more than once, it might be an unnecessary step... sometimes, however, after I wrap lead and floss as an underbody, I crush that creating a
FLAT BODY, nymph... if one didn't use the floss, the lead would break and fall off the hook...
AND, in the spring, especially in pocket water I add a split shot or two to my leader... normally one or two BB's... if I need more, I increase the size of the shot... I never use more than two shots with weighted flies, too much going on in the air as I cast/chuck/lob the heavy combo upstream...
As for sinking lines and sink tips... normally I only use sinking lines when trolling streamers in lakes and ponds.... I have a couple sink tips, but don't use them much any more at all... I did use them when probing deeper waters in the Adirondacks... I don't find them necessary in the Catskills...
So there you go, no one answer...

no one size fits all here....

at least for me...
Ed
PS - All of this said, I do
NOT weight all my nymphs... some are just fine, and fish better - like Isonychia patterns - unweighted...

PPS - Almost forgot --- Coneheads... I do
NOT use these on nymphs, nor wets, but on several streamer patterns, some of which I tied on NYMPH hooks, and fish as nymphs - like small Black Conehead Woolly Buggers....

I guess, that's one way of bending the rules...
