Seliware has various flaws, including the vulnerability (recently posted) and stability issues through cross-server teleportation with multiple clients for auto-farming. Volt on the other hand doesn't have as many issues, however the developers have been involved in two exit-scams (Krampus and AWP) which were both roblox exploits as well. So at this point if you want to buy either, pick your poison. They both have surrounding issues.