Which polarization (HH or VV) is good for Glacier velocity?

Currently I am working on Glacier velocity. I used some data with HH polarization (according to a tutorial) for glacier velocity estimation but HH polarization is not available for my study area. These are only VV & VH available. Please someone can explain about selection of polarization for glacier velocity ?
Thanks

HH is better due to increased penetration but VV should work well too.

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Thank you for your kind reply @mengdahl