What would be better in terms of search engine optimization. If I want to target for example "chairs" is: chairschairs.com or bestchairs.com preferable? I am talking only about SEO (and SERP) here, not in terms of what looks the best. Is there any difference if I target a two word keyword, such as for example "office chairs". officechairsofficechairs.com or using an additional random word: theofficechairs.com
Well, I would go with best chairs. Because chairs is being repeated, normally no one searches with two chairs. You might end up with a search best chairs, or just chairs. That would be enough for SEO.
In most cases, you should try to use a stop word where possible, if the exact match domain isnt possible; however these things also require an element of common sense; a 'brand' is far more powerful than a keyword rich domain. In your scenario, keep it to niche websites only where you are targetting a certain phrase, and products within the niche. Using a duplicate keyword will have no extra SEO value; in fact, it will look far too spammy; imagine if chairschairs.com wasnt available? What next? chairschairschairs.com? Im sure you can see where im going. There are lots of stop words you can use before or after the exact keyword phrase; if you cant find them, shout.
Well, if I want to only target this one keyword "chairs". Which domain would place better on a search for "chairs" chairschairs.com or bestchairs.com, provided everything else was equal.