Is WPA-Enterprise and PEAP secure when using shared username and password?

I have been using WPA-Personal PSK. SSID and pre shared key are same so connecting to network is easy. I know that in this way clients can connect to rogue access points and other user can decrypt data if they capture packets when client is connecting to access point.

I'm planning to use two SSIDs. One is open and one using PEAP.

If I use PEAP and SSID, username and password are same is network secure? Can users decrypt eachother's traffic?