From 50 operaors to choose from (25 on attack and 25 on defence) its hard to stick to one play style. to keep it short im going to give you my top 4 operators to play. (2 attack and 2 defence)
#1:Ash-
Starting off with attack is Ash. Ash is a part of the F.B.I and she is known for her rusing capabilities. She is a 3 speed 1 armor operator so she can change her angles of attck in a matter of seconds. Always keeping the enemy team on there toes she can be an extreamly vaulable team member to have. her two primaries, the R4C and the G36C, are great guns with the R4C's fast rate of fire and low recoil it is perfect for rushing into the objective for a few easy kills. Her G36C does slightly less damage but has the ability to attach a acog sight meaning you can hold longer peek angles on bigger maps. Looking at her stats it is no wonder the people that main her are widely hated umung the comunity.
#2:Jackal-
Jackal is a operator from GEO located in the contry of spain and he is known for his intel gathering capablities. He is a 2 speed 2 armorand his gadget, the "Eyenox", can locate foot steps on the floor and can track them reveling the location of the player to your whole team. However you can only use the tracking ability three times before it is disabled, after that you can only see the foot steps. His two primaries are the C7E and the PDW9, both are decent wepoms with ok specs. he is great in casual but is almost always banned in ranked games due to him being hard to counter if you dont have a mute on your team.