Which dioamond ring should I buy a solitaire diamond ring or a diamond ring of small diamonds of same carat weight?

Buy which ever one YOU like! Everyone has a personal preference.

Personally I prefer smaller diamonds ring or three stone rings.

You can view a great collection of three stone rings at below websites and reduce your confusion :

B2CJewels.com (http://www.b2cjewels.com/Three-stone-diamond-wedding-rings.aspx)

Zales.com (http://www.zales.com/subcategory/index.jsp?categoryId=2109182)

JewelryCentral.com (http://www.jewelrycentral.com/three-stone-rings/)

Large diamond solitaire will retain its value better than the ring with more but small diamonds.

But in the end of the day it's a personal preference, some people like the traditional, classic look of the solitaire but other like to have more diamonds and opt for a three stone or a ring with various side stones.

Shenoa Diamonds (http://www.shenoadiamonds.com)