SWIM would recommend the stainless steel bat, if any. The glass VG looks sweet but if you're looking for something indestructible that will last you a lifetime, go for the stainless.
Also, the aluminum may be cheaper, but it's aluminum. Whether it's herb or spice that you're vaping, aluminum will get very hot, very fast.
SWIM's dog and cat were vaping spice in a stainless bat a bit ago and it got a little warm, but it's wrapped in bee line (hemp wick) for a rustic feel, but also to protect fingers. It was warm after two hours of back and forth vaping (worked very very well. No question there), but SWIM's dog said he can't imagine how hot an aluminum bat would get.