Yes i've day-traded both of these equities at times, almost exclusively
One is common (PBR) one is perferred (pbr.a)
Pbr- Is slightly higher priced (28.27 todays close)
Pbr.a- Is slightly lower priced (25.96 todays)
Pbr [common] is more liquid and has a bigger intraday range
Pbr.a...