In Google's search results, you can differentiate between SEO and SEM by looking at the position and labeling of the results. SEO results appear below the ads and do not say "Ad" next to them, while SEM results are at the top and have a label that says "Ad."

Ultimately, the choice between SEO and SEM depends on your goals, budget, and timeline. If you're seeking short-term results and have an advertising budget, SEM can be a suitable option. On the other hand, if you're aiming for long-term results, organic visibility, and are willing to invest time in optimizing your website, SEO may be more suitable. You can also consider a combination of both strategies to reap benefits in the short and long term.

If your main goal is to position your website in search engines, I would recommend primarily focusing on SEO. Here's why:

1. Long-term sustainability: SEO involves optimizing your website and content to be relevant and valuable to search engines and users. As you improve your SEO, your site gains authority and improves its ranking in search results. This means you can obtain sustainable organic traffic in the long run without relying solely on paid advertising.

2. Credibility and visibility: By focusing on SEO, you work on improving the quality and relevance of your content for search engines. This not only helps your website appear in search results but also increases its credibility in the eyes of users. Users tend to trust organic results more and are more likely to click on them.

3. Cost-effectiveness in the long run: While SEO may require time and effort to yield results, it can be more cost-effective than SEM in the long run. SEM involves paying for each click on your ads, whereas SEO does not require a direct expense for every visit you receive through organic search results.

However, this doesn't mean you should completely disregard SEM. You can consider using SEM as a complement to SEO, especially for driving quick results and specific promotions. SEM can be beneficial for obtaining immediate traffic while you work on improving your SEO.

SEM (Search Engine Marketing) offers several significant benefits for promoting your website. Firstly, it provides quick results by allowing you to appear in search results immediately through paid ads. This gives you the opportunity to generate traffic and visibility almost instantly. Additionally, SEM provides a high level of control and precise targeting. You can select keywords, set geographic locations, specific schedules, and target specific audiences, enabling you to reach the right people at the right time. Another key benefit is the detailed measurement and analysis capabilities offered by SEM. Advertising platforms provide precise information about the performance of your ads, allowing you to evaluate and optimize your campaign in real time, maximizing results and adjusting your strategy based on the data obtained. Furthermore,SEM is flexible and scalable, as you can set a budget and adjust your campaigns based on the results and return on investment you're getting. Lastly, SEM can complement your SEO efforts by providing additional visibility in search results.

In summary, SEM offers quick results, precise control, detailed measurement tools, flexibility, and the ability to complement your SEO efforts, making it an effective strategy for promoting your website.

If you want to position your website in the long term and obtain sustainable organic traffic, I would recommend focusing on SEO as the primary strategy, complemented by SEM according to your specific needs and goals.