Cloudfare DDNS vs NO-iP DDNS +PiVPN, any main differences?

im setting up a DDNS because my router changes iPs all the time.
im getting into VPNs more now and want to set up “NO-iP.

i was going to go with cloudflare at first,
but I’ve had bad luck with payments getting over charged on other tools.

so, NO-iP, has a completely free tier,

is there a big difference to just…stick with cloudflare DDNS?
or at first, is there any hiccups when using others., other then cloudflare?
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