Ang opinion ko, it really depends on the sound you're after. Just think about it:
A reverb pedal will sound different from spring reverb on your amp, and much different when you add reverb across the mixer and record it in real-time, and iba rin ang tunog ng reverb na dinadagdag sa mixing. REVERB PA LANG YUN!
Personally, if I want that Shadows/Ventures type of reverb, by all means use an amp's spring reverb. If I want a cleaner reverb in my signal but I feel that I want to hear it processed while recording, I put it through the mixer and tap a miked signal to another channel, so I can mix signals in the mixing. Now if I long for CONTROLLED airiness, that's where plugins come into the picture.