Sorry that I missed this. I only use the red ones. The blue and green are the older models. The red is their newest and you can trust me there is such a big difference between the two. Not so noticeable in the picture. They are a bit smaller with a much better spring. I can trim nearly twice as much with the red ones as the blue or my older fiskars. Not sure if there are any tool guys out here but the perfect way to describe this is ryobi with a dull blade vs Milwaukee with a new diablo blade.Hi BigSm0, Quick question --- the Hydrofarm trim scissors seem to come in both curved and straight tip, and the curved come in stainless steel or titanium. Curious ... which are you using?