Difference between Personal and Commercial Firewall.

Hello , i read quite few Thread on Firewall. I too m thinking of having a Firewall installed, many people has redirect Links on Personal Firewall ie.,Look 'n' Stop Firewall , Jetico Personal Firewall etc.
I just want to know the Difference and which is Better: Personal or any Commercial one. I m thinking of Personal since its light weight. ​

Which is better :

1. Look 'n' Stop Firewall
2. Jetico
3. Comodo
4. Zone Alarm etc.etc...

 

That was a stupid Question, any Commercial FireWall are Personal Firewall. Please correct me if i m wrong.
GOT ZONE ALARM : FREE VERSION DOWNLOADED
http://www.zonealarm.com/security/en-us/cdn/zaxs/20090819.htm

I should read other Threads more often, before posting. Kind of feeling really stupid.

Thnks.