I like buzzme because it works on everything that rings and vibrates without configuring anything and it's free.
Vibandring you have to set your profile to tone only and if your ringtone is shorter than the ring duration, your tone only plays once but the vibration continues to the end. Other than that it's more configurable than Buzzme though. But free + easy to setup + works with short tones is why I use Buzzme even though I bought Vibandring.