I have sold these two types of property before, so I can comment a little:

Semi-D:
-tend to appreciate faster generally
-usually able to match valuation price
-some ppl have perception semi-d is higher class than corner despite smaller land size (And your neighbourhood is semi-D
-smaller empty land size then corner usually, unless you are getting semi-d corner with extra big land.

Corner:
-very rare usually, so people upgrading from same taman intermediate to corner usually don't mind paying crazy price (100k above valuation in my experience)
- Some ppl like to buy corner due to it';s cheaper price, tear down the whole house and build whatever they want, so the demand is there as well.
- Some ppl just like corner, to get complete sunlight from one side (fengshui thing)
- usually larger land size for bigger scale of gardening. some people like it.

This post has been edited by surf-it: Jul 9 2011, 11:32 PM