°K to °C conversion: hardware or software?

I have to measure two temperatures:
the first one is outdoor, the second
one instead is indoor.

So I was thinking to use two very common
sensors: AD590 for the outdoor and
LM335 for indoor.

The measurement will be managed by
a National Instruments DAQ USB card;
the temperature will be displayed on PC.

The unit to use must be °C; the sensors
are in °K so, of course, I have to
make a conversion.

Then I have two options, the first
"software" and the second "hardware"

1 - Acquire voltage related to °K
 (10mV/°K) - for the AD590 I have
 to use a I/V converter (of course)
 then convert it (with a simple
software statement in source code) in °C

2 - Acquire voltage "scaled" to
0...5V, -20°C->0V and 40°C->5V

Thanks to Google I saw that the first solution
is rarely used while the second solution
is more used but of course involves more
components.

I was wondering which solution was the better
and why "software" solution is rarely used.

Thanks
.

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