I disagree. I've had exactly 10 friends who have tried both the yellow zoo yorks and the green telephones on separate occasions 3 weeks apart(zoo yorks first, green telephones second). I myself have only consumed the green telephones. Hoever, my friends unanimously said the green telephones were more potent, it lasted longer, caused more eye wiggling, jaw clenching was about the same as the ZY's, but most importantly everyone agreed that they were extremely clean, noticeably cleaner than the zoo yorks. By clean, they meant they were able to sleep easier after coming down from the green telephones.
Since I am only able to compare to other pokeballs and not the zoo yorks, in the past I've consumed several pokeballs such as white butterflies, orange euros, yellow stars, purple cupids, yellow macs, and purple dragonflies. the green telephones were right up there with the orange euros and yellow stars. they were fire! mainly because they were really really potent, comedown was one of the cleanest.