I like the super long batts, so I went with the Bloog maxxfusion. Bloog batts are cheaper, but the SI cartomizers are cheaper. Refill liquid is cheaper with Bloog, but you can personalize more and earn points on SI. Both companies have been good to me. I had a friend that vapes nothing but Bloog's RY4. I told him about SI's RY4 and he says they are quite comparable. RY4 is the only tobacco flavor I'll vape. I tried the SI sampler and hated all but the RY4.