The monthly plan works if you would rather not put money on the table at the start and prefer domain, hosting, maintenance and changes to sit in one line you never have to think about again. At €24.80 a month the site is live, updated and supported, and small changes do not turn into a quote every time.
Paying once works if you would rather close the cost and carry no commitment. At €350 the site is yours; €150 more gets it properly set up to be found on Google and Bing, and from then on you pay nothing beyond domain and hosting.
One thing we say reluctantly, but we say it: a high, vague monthly fee — from anyone — is often the price of the website spread over instalments. Ours is deliberately low because it is not that: it is the service, not the site hidden inside a payment plan. If after 24 months you want to move to owning the site, we sort it out without drama.