Hello Dixon,
As Jay said the DS1820 is more accurate, I used it in a few projects
and it wasnt very difficult. If your not using interrupts or can disable
the interrupts during the R/W routines it may be the better choice.

If you are planing to locate the DS1820 remotely
Be aware one thing Dallas does not discuss is protecting the DS1820
from damage from nearby lightining strikes,Let me know if you need advice about this.
Bruce