New set of Speakers Need Help!!

[Makaveli]

Deciding to purchase a new set of speakers but need some help.

Creative Inspire 5.1 5300
Product Specifications

Satellite power: 6 watts RMS per satellite (5 satellites)
Subwoofer power: 18 watts RMS
Frequency response: 47Hz-20kHz
SNR: 75dB

Altec Lansing ATP5 Five Piece System
Product Specifications

Drivers (per satellite): Two 28mm full range, One 3-inch mid/bass
Driver (subwoofer): One 6-inch full range
Frequency Response: 45 Hz - 18kHz
Satellite Power: 35 Watts (4 channels)
Subwoofer Power: 45 Watts
THD: <0.8% @ 1 Watt @ 1 kHz
Input Impedance: >10K ohms
Input Sensitivity: 300 mV for full output
S/N Ratio: >65 dB
Built-in Power supply included
ETL/cETL approved

Which is the better set of Speakers based on SNR or Watts vs RMS.... Help please need some Advice!

 

[Makaveli]

Also will I get better sound quality out of a 4 speaker setup digital, or a 5.1 analouge???
Or is the diference between digital and analouge sound not really big?