I think the issue with TIMPB is liquidity. A position with TIM is easier to liquidate should things turn nasty. In this sense holding TIM is less risky than TIMPB, especially for short-term traders.
TIM Price at posting:
12.5¢ Sentiment: None Disclosure: Not Held
A personalised tool to help users track selected stocks. Delivering real-time notifications on price updates, announcements, and performance stats on each to help make informed investment decisions.