We really like entry #2 because its simple yet interesting and plays with the first two letters transforming them into an element (almost an icon). It also represents a flow between the O and the P. We like better this colors rather than #1.
Hi, Thank you for your kind words, i really apreciate them. :) I´ll work on some more variations, to see if i can improve it, Let me know if you have any ideas you would like me to explore. Best Filipe