I have 3 Vamo V3's and one SID. The V3's 3 button is way better, IMO. The plus side to the SID's one button is you can't bump it and change settings. Back to the three button. With this you can check ohms, battery, and current volts/power just by holding a button. I like that. At the same setting I get the same vape from each, which is the most important. The SID is definitely lighter. The VAMO is a little bit longer but the SID is a little bit fatter. So IMO what it boils down to is what feels better in my hand. For me it is the Vamo v3