I don't know what the 'correct' thing is to do, but I'm (very slowly) moving from one to the other, and I figured I'd be less at risk of blocked ducts etc if I kept as even a time as possible between feeds - i.e. rather than dropping an evening feed and perhaps not feeding between, say, 5pm and 7am (on the odd night DS sleeps through), I dropped a mid morning feed. I started with (roughly):
7am BF
10am BF
12pm BF
2pm BF
5pm BF
7pm BF
night time BF
and moved to
7am BF
10am bottle (he now often doesn't take much, and takes a bit more before his lunchtime nap)
2pm BF
5pm bottle
7pm BF
night time he mostly sleeps through, but BF if he wakes
Next feed to go will be 2pm one, but I keep it up at the moment mostly so I have a decent supply so that if we want to be out and about I can BF him all day instead of taking bottles.
DS is now 8 months, so we've been doing it v slowly, but I think the ideal is to drop no more than a feed every few days, to give your supply a chance to adjust.
None of that is 'textbook', just what's working for us.