There's already been a couple threads about this here on T11.
It's hard to say which one is "better" objectively. For me, Venom is better. I don't like motorized reels, and Venom has an innovative design, so it's better for me.
But for many people, Tarantula will be the better option for the lack of clothing restrictions and a few other things mentioned in the other threads.
It really comes down to what you want to do with the product as to which will be "best".
A quick way to decide - which trailer excites you more?