Could you suggest a suitable domain? Is there any downside to using the pro domain? Will this impact the website's SEO ranking?
Is the dissimilarity simply in the lettering? What is essential for the website is a freelancer's portfolio.

I once came across an individual who decided to test out purchasing identical domain names on different first-level domains to see if it made a difference in performance. All domains had the same conditions, and it turns out there were no benefits of using the .com domain. The only difference is that browsers often assume .com as the main domain, but this doesn't necessarily affect SEO.
It's a good practice to remember the default domain for consistency purposes. However, a freelancer's portfolio may not necessarily require a .com domain.
If you're looking to show your longevity in the market, then perhaps using a .com domain could be beneficial, especially if it aligns with your brand image and identity.

In terms of search engine optimization, the domain name choice doesn't matter too much. However, I would suggest going with PRO as it is more aligned with the overall theme and purpose of the website.

 remember that a domain name is an essential component of a website's branding and identity. Therefore, choosing a name that resonates with your audience and aligns with your brand values can make a significant impact on your online presence. Additionally, it's essential to ensure that the domain name is memorable and easy to spell, as this can help with word-of-mouth marketing efforts.

The pro domain, such as ".pro," can be a good choice as it conveys professionalism. However, there are a few downsides to using a pro domain.

Firstly, pro domains are not as common as other generic domains like ".com" or ".net," which means people may not be as familiar with them. This could potentially lead to some users being unsure if the site is trustworthy or legitimate.

Secondly, using a pro domain may not have a direct impact on SEO ranking. Search engines like Google prioritize factors such as content quality, relevancy, and user experience over the domain extension itself. However, having a relevant and memorable domain name can indirectly influence user behavior and engagement, which can positively impact SEO ranking.

In terms of dissimilarity, the main difference between pro domains and other generic domains lies in the lettering (e.g., ".pro" versus ".com"). The choice between them doesn't fundamentally affect what you can showcase on your website, such as a freelancer's portfolio. The content and design of your website, along with effective marketing strategies, will have a more significant impact on attracting potential clients and improving your portfolio's visibility.

Here are a few additional points to consider when choosing a domain for a freelancer's portfolio:

1. Branding: Choose a domain that aligns with your personal brand and conveys the services or expertise you offer as a freelancer. A domain that reflects your name or professional niche can help create a strong brand identity.

2. Memorable and Easy to Spell: Opt for a domain that is easy to remember and spell. This can make it simpler for potential clients or employers to recall and revisit your portfolio.

3. Relevance to Your Audience: Consider your target audience and the industry you work in. Is there a specific keyword or phrase that could be included in your domain to make it more relevant to your audience?

4. Consider Multiple Extensions: If the .com or .pro extension is not available for your desired domain, consider other extensions like .net, .co, or country-specific domains (.us, .uk, etc.). However, keep in mind the potential downsides mentioned earlier regarding unfamiliarity and trustworthiness.

5. Avoid Trademarked Names: Ensure that the domain you choose does not infringe on any trademarks or copyrights. You can search for existing trademarks before finalizing your domain to avoid legal issues.