Sandbox solution and farm level solution

Sharepoint 2010 has introduced a new concept called sandbox . Solutions can be built on this format so that they reside at site collection level independent of sharepoint farm.
On the other side you can also build soutions at farm level , as it used to be in 2007. Lets now see the differences in these approaches .

Sandbox :
It is a place where we can deploy our solution i .e : Site Collection.
Solutions in sandbox will have partial trust level with restrictions for accessing resources on servers, database,calling unmanaged code.
It can be monitored,managed by site collection administrator.
Since it is indepenedent of farm, the solutions will not have any impact at the farm level.

Farm level :
Solutions are deployed at the farm level.
Solutions execute with full trust. Unlike sandbox these solutions doesn't have any resrictions.
Farm level admin can manage these solutions .

Given the differences it is now left to developers to either go for sandbox or farm level solutions.