I own [word1]and[word2].com as well as [word1][word2].com. Which should I use for my main domain?

Is hard to tell just like that. You can do some research online. Look up what searchers are currently entering into their queries, what does google give as possible search options... Do people search more as a conversation word1 and word2 ? Or without the and?

For online sharing purposes you might want a shorter domain but that shouldn't stop you from going with the longer one because you can get "shortlinks" created for Twitter and such, also length is not an issue if you share clickable links that don't have to be retyped by your potential visitor.

Your domain had to be SEO friendly... But also not an issue at the beginning, regardless of domain you will have to do a lot of SEO and marketing work to build relevance online so Google shows you in queries that don't include your direct domain name...

My suggestion: If your product or brand will be mentioned out loud or read a lot to include the AND then include that in your domain..

It's usually better to go with the shorter version if possible, for the sake of making it easy for people to type in. However, if it's a branding issue then the longer one. If people know you as "frank and oak" then that's better to go with frankandoak.com verses frankoak.com. If the second redirects to the first, you win no matter what.

Don't use a domain with "and" in it

It is considered a noise word from an SEO vantage point.

It adds nothing to the domain from a branding point of view.

Barnes & Noble uses BarnesAndNoble.com. But they also forward BarnesNoble.com (without the "and") to their website. Beyond that, they ALSO own Books.com / Book.com and forward that pair to the full brand name: BarnesAndNoble.com.

There may be cases when shaving off the "and" is justifiable. But it's dangerous to give specific advice when we've been given no specifics!

I'm lost. Should I go North or South? Well, that depends where you are and where you're trying to go.

Depends on the words. Rolls Royce fit together nicely. Johnson and Johnson need the and. How customers, clients and management say it on the phone and in public is far more important than SEO comments below since that can always be fixed

According to research from Domain Name Stat, 43% of all domains have the “.com” extension. While there are many successful websites with a “.net” and “.org”, your website will probably do better if it has a “.com” extension. If these are taken too, you would be better off brainstorming a new domain name. Creative and brandable are always better than generic. A brandable domain name is unique and stands out from the competition, while a generic domain name is usually stuffed with keywords and unmemorable. These are horribly generic. When people hear those domain names, there is a trust factor there. In general, when it comes to the length of your domain, shorter is better. Easy to pronounce. Your domain name should be smooth and punchy – hyphens and numbers get in the way of that.
You can read more here: https://websitesetup.org/choose-domain-name/
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath