Important to distinguish that BIP.UN.TO is not a "fund". It is a company that manages assets, while CIF is an ETF that tracks many companies (including some owned by Brookfield).
The answer here is simple. If you want a more concentrated play and a bet on a strong management team to drive returns from digital infrastructure (data centers, fiber networks etc) then I do believe BIP is a strong play.
If you want single click exposure to global infrastructure tailwinds, CIF.
What I would choose is solely dependent on what you want as an investor. CIF will provide lower volatility as it is a broad play, whereas BIP.UN being an individual equity is much more concentrated with higher risk, but higher potential returns.
I personally would opt for the global exposure. However, that is completely up to you.