Vanguard FTSE global all cap index fund vs HSBC FTSE all-world index fund? (Brand new investor)

Hi,

I’m just opening my first pension (SIPP in the UK), and am looking for what to put my first ever investment in.

It’s looking like a global fund is a good starting point, and I’m stuck between the vanguard and hsbc. Looking at the graph of the HSBC one it has dropped ridiculously in the last few months so does that mean it’s a good time to buy? Vanguard one has dropped too but overall seems more consistent, but higher fees.

Any general advice would be helpful – either deciding between the two, or should I go for something else?

Thanks