Here is a good thread on the plugs.
http://www.ball-pythons.net/forums/s...ad.php?t=18791
Herpstat for me all the way. Proportional maintains the temps via small trickles of power to heating source based on settings. On/Off is just that, its On to heat up the source and off when it reaches the temps based on settings. Most folks would agree to get a proportional type over on/off. Something about enclosure efficiency lolHope it helps.