Jailbreak better on ios 6 or 7?

Ok so i'm buying an Iphone 5 on ebay and I've been seeing that Ios 6 Jailbroken is more stable and faster. I don't know if ios 7 jailbroken is good or not. So my question is if the jailbreak on ios 6 is better than ios 7?

There are more tweaks that are supported for iOS 6 than there are for iOS 7. Eventually they will all be updated, but as of right now, iOS 6 is probably the safer bet. If you're looking for Winterboard, Zephyr and other popular tweaks, especially.

As of right now, iOS 7 jailbreak just comes out and there are still many to improve.So, actually to this extent, iOS 6 jailbreak is better. But iOS 7 is more powerful as we know. That depends. Make your own decision.
By the way, if you failed to jailbreak and iPhone stuck on Apple logo or recovery mode, and reboots continuously, try this free and fantastic ware - Tenorshare ReiBoot.
It is available online free. Search it on google.

Weird, I'm having the same problem, with any tweak or setting i installed, at first it worked and all of a sudden nothing works or shows up. Then i get some help from below online and able to recover my ios 7