Free Version Less Performing Than Paid For The Detection Of Virus / Malware Recent

Hello,


Can you tell me why the free version of BitDefender discovers / blocks few new malwares unlike other antivirus (such as Kaspersky, Comodo, etc) or BitDefender (paid version) ?


is there a difference for the detection level between the free and paid versions ? kind of heuristics in addition to the paid one ?


further updates perhaps?


thank you for your return.