I’m thinking about am Arduino based sequencer module for which I might want to use rotary encoders, e.g. to select sequence length (say 2 to 32). Not sure whether I’d use a built in push switch or not, depends on the ergonomics. This’d be the first time I’ve designed something with rotary encoders so:
What are your favorite encoders?
Conversely, any encoders you recommend avoiding?
I’ve been using the EC11 types, for the clock divider and the rhythm generator. I believe SR passives brand, but I guess its all the same. Contacts are bouncy as hell, but that’s to be expected. With the proper hardware denouncing and interrupt capturing, no complaints!
I used these. They work. Nice knobs, but the breakout pcb doesnt really suit most of us round here. It might though depending on your design.
Works out to be around $1.86 per encoder.
These also seem to be the ec-11 type 
I got some from ALPS, if I remember correctly. They are fine and sturdy and work great on my braids, but I was surprised how long the shaft is! The knob looks a bit funny now, but all good! xD
( ͡° ͜ʖ ͡°)
if you want to have multiple easily you could try this board
well I’ll be damned, just when I spent all that effort to do it with a mcp23017 
i have a pair, only did some initial testing but they work…
I bought a bunch for an unrelated project a while back- hopefully they work.