Manfrotto 055CXpro4 alternative

They are different tripods for different purposes.  It's a bit like asking "if you could only have one lens, which would it be?"

The Manfrotto is taller, has an adjustable centre column (useful for macro), and I have paired it with a quality ballhead - so it is primarily a home/car tripod (although it is light enough to carry easily, it is long).

The Sirui is decent quality, and compact - for ease of carrying.

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Cheers,
Damien