Which Sony and which Samsung have you been using? If you're staying below 40 or so watts per battery, you should get similar performance from the Sony/Murata VTC6, Samsung 30Q and LG HG2. You'll probably get better performance from different models if your wattage is higher, but the best model will depend on how high. As others have said, to give you the best advice it would help if you could tell us:
- Which model Sony and Samsung you use
- What wattage you vape at, and which mod you're using (dual battery or single battery being the most important aspect for battery recommendations)
Let us know, and we'll be happy to help you figure out what's going on and how to optimize your batteries.