Are links to the site more important, or are the links to the page more important.

If you have a page on your site dedicated to the "ceramic tile kitchen" keyword, you obviously want to build backlinks to that page and not the homepage. You want a good, but not overwhelming amount of those links to have the anchor text of the keyword you're targeting. Anchor text diversity is important though. Links to the site (or homepage) are going to help that specific page rank high as well, as it improves the overall authority of your site.

^ URL diversity is an important factor today. Only building links to your homepage is going to get you into trouble. Sure, the homepage is of course the most important page, but disregarding your inner-pages is not a good long-term strategy.

"When I check the backlinks to the page most of them have no backlinks to the page" It's a good signal. Don't worry too much about the domain authority. Of course the links to the page is more important for you to determine the competition. You can beat those pages easily. Because they don't have much backlinks.

You should understand the concept of "link juice" and has it flows through a site. If the home page of the site gets a link, and the home page in turn links out to 3 other pages on the site, each of those pages gets a portion of the "link juice" from that initial link.

So links to the home page are incredibly important and if the site is properly structured, meaning the internal linking is designed in a way to pass the link juice from the home page to the inner pages in a correct fashion (search "silo"), then the inner pages are getting a lot of value from those home page links.

With that said, it's okay for you to do smart link building to your inner pages as well. But I would send more to your home page simply because that's natural. Most links are to the home page of a site. So do that, and mix it in with the occasional link to your inner page.

Can you outrank these sites? Tough to say. But you don't necessarily need to get to #1 in this situation to get a good portion of the traffic. If a visitor gets search results and the top couple of sites are a Home Depot or a Lowes, and then they see your site, they're likely to go to your site if they are more interested in finding information versus making a purchase right now. That's a pretty big assumption I'm making but I think in your case it's a fair one.

Making most high quality links to homepage is a good practice, but be sure that homepage should include everything that you want to offer..While internal linking also make a link to the homepage..It will give more weight to your homepage internally..

Build backlinks to inner pages and the home page. Building links to only the homepage may actually do you no good. Build quality links to all pages and vary your anchor text. Build links from a variety of sites like web 2.0, press releases, articles, bookmarking, document sharing sites etc. To add more power to your backlinks, you should go for tiered backlinks.

Always build good backlinks to your inner pages. Your homepage will get ranking from ALL those backlinks because from the inner page there is a LINK (no matter it is inbound link!) to the homepage!

To point your backlinks to the homepage of
your site and to point it to individual post
on your site (Subpages) please i want to
know which one is best approach to make
your site rank on search engine?

A great amount of quality backlinks for the home page really helps a lot. It adds authority to your website, and whenever you publish an article, it will most likely rank quite nicely without any backlinks at all. However, backlinks to individual pages of your site are just as important. I'd recommend to work on both.