Both .com and .co.uk extensions are excellent options for any business entity around the world. They have a credible track record, so if you have a new company, it will be less subject to suspicion.
That said, which one you should pick depends on where your target market lives. Due to the country code, registering a .co.uk address is best if your company mainly caters to a UK customer base on the internet.
On the other hand, .com is much more well-known on the world wide web. Thus, it’s a better choice if you want to reach internet users all over the globe.
It’s not unheard of that a business name has both .com and .co.uk domain extensions. Doing so lets a brand create two different versions of the same site – one that serves the general audience and one tailored to UK visitors.