You can have online chat and discuss live with sales person for further clarification and all the details you wanted to know.

I am happily enjoying their services since last 4 years and am very much satisfied. I transferred after test and try of several hosting companies but this one is The Best.

I have hosted many domains on 1 single account and have got no issues with them till now.

You can see that they are hosting over 1,000,000 domains which means ofcourse they are the best.

Good Luck
References :
khurrum.com

Both will give you the best support of any hosting company around. Dreamhost is employee owned, so they seem like they truly care about thier customers. Hostgator has awsome support. I have accounts with Dreamhost, Godaddy, Hostgator, and Justhost. Withouth a doubt, of all those Dreamhost and Hostgator by far have been the best.

As for your question about space, both of them offer unlimited server space, unlimited bandwith, and have options for unlimited domains. So you could run multiple websites off of one hosting account.

I have had no downtime on any of my sites and thier support is great. Dreamhost also offers a 100% uptime guarantee and they even have a $97 day money back guarantee if you decide you dont like them. That way you can try them out to see if you like them.

As for maintaining a site after publishing, both Dreamhost and Hostgator have a great webpanel for maintaining and keeping stats on your site. Hostgator uses cPanel, which is one of the top site config and management software available. Dreamhost has their own in house software they designed, which is super easy to use and they offer great support for it.

I would say Dreamhost is slightly better than Hostgator, but they will both treat you great and offer one on one help in case you run into problems, whereas some of the big companies, ie godaddy are terrible to deal with if you need one on one support with someone that speaks good english, especially if your not tech savy.

Here are some Dreamhost coupon codes in case you decide to try them:

20OFFHOSTING ($20 Off Hosting Package)
2DOMFREE (2 Additional Free Domain Names with Signup)
1IPFORFREE (Get 1 Free Lifetime Unique IP)
65OFFHOSTING ($65 Off 1 Year Hosting Package)

Here are some coupons for Hostgator:

SNOWMAN (20% off)
BOSTON (25$ off)
HOUSTON ($25 off)
HGC25 ($9.94 off new hosting)

Read comparisions of them both as well as some other hosting options here:

http://internethostreviews.com/

Good luck!
References :
http://internethostreviews.com