New piers..brick or steel

I found someone to have a look at my wood framed cottage which needed floors relevelled. The original idea was to "jack and pack" the brick piers but a few hours into the job the re level guys rang me to say that as they packed the piers the house would simply resettle and push the brick piers further into the ground. This was due to the "dry sandy nature" of the soil with the piers apparently "literally sinking back into the dirt, visibly moving down". This was "worst case scenario" meaning a simple jack and pack would not cut it. So the advice was to replace a number of piers, concrete in underneath them and do it properly. I'm OK with this if its whats required and have been offered the option of brick or steel piers. Are there advantages/disadvantages with each option? The costs will be the same. What would you recommend?

Thanks


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