G.Network versus Community Fibre

We are coming to the end of our BT contract in 3 weeks, and looking to get reasonably fast FTTP.

G.Network dug up our South London neighbourhood in November so their lines are right on our doorstep. The only real competitor is Community Fibre who I assume would have a lot more work installing their fibre.

However, when I look at the pricing for 500/600 Mbps, Community Fibre seem to be half the price - £18.75 monthly (£225 first year total) versus £51 monthly (£456 first year total) for G.Network

What am I missing - is it a no brainer to go Community Fibre for 12 months??

CF
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Community Fibre at least reply to emails, a feat that seems to elude G.Network.