There are two tablets currently available. Wegovy tablets which is the same medication as in the Wegovy injections. The tablets need to be taken daily on an empty stomach (min 8 hours fasting) with a small amount of water and then absolutely nothing consumed for at least 30 mins. They are a bit less effective than the Wegovy injections. Both are less effective than Mounjaro.
Then there's the Foundayo tablets which are less effective than the Wegovy tablets, but can be taken without any of the restrictions that the Wegovy tablets need.
In terms of which pharmacy or company to choose, it really doesn't matter. The medication they supply is exactly the same wherever you get it from so personally I would be mainly guided by price and TrustPilot reviews.
Some companies like Voy, Numan, Bolt etc operate as a subscription model where they will automatically charge you for the next prescription every month and may assume that you automatically want to step up the dose, or stay the same etc. To change that you'd need to log in to your account and change it before the next order. They also have minimum subscription times, 3/6/12 months can be common. Some may charge a cancellation fee if you want to leave the subscription before the end of the term.
Some companies, often the subscription ones, want to justify their prices by offering additional services alongside the medication. Usually apps, AI chat bots and things like that.
It's worth remembering that you can change pharmacy at any time to take advantage of a good new customer deal.