When to choose .online?
.online can be better when the context associated with that extension is immediately recognizable. Availability and registry requirements should still be checked.
When to choose .site?
.site can be better when the project needs a different reach, a shorter variant or industry fit. Important brands often secure both addresses.
Pricing and premium names
Not every available name has standard pricing. Some TLDs may have premium names or special conditions, so the final price is shown by the active Hostilla.pl domain pricing path.
What about DNS, e-mail and redirects?
If both variants are registered, one can serve the main website and the other can handle redirects, campaigns or brand protection. E-mail requires deliberate MX, SPF, DKIM and DMARC planning.