Air Optix Aqua versus BiofinityAir Optix Aqua from Alcon Inc. and Biofinity from CooperVision Cinc. are high-performance monthly replaceable contact lenses using a silicone hydrogel material. Air Optix Aqua can be worn up to 6-7 days without taking them out and Biofinity up to 30 days in extended wearing mode (as prescribed by your eye care practitioner) 
Biofinity lets more oxygen pass through the lens to your eye, is slightly thinner than Air Optix Aqua and covers a broader prescription range (from -12.0D to +8.00D). The average daily cost of both lenses is in a similar range.

By the way, the two companies have released 'upgraded' versions of the two lenses: Biofinity Energys and Air Optix with Hydraglyde. A comparison can be found here.

Air Optix Aqua and Biofinity - Spec Sheets

 
AIR OPTIX AQUA
Biofinity
Product Image Air Optix Aqua Biofinity
Manufacturer Alcon Inc. CooperVision, Inc.
part of
The Cooper Companies Inc.
Release Date 2008 2007
Prescription Parameters
Replacement Schedule Monthly Monthly
Wearing Details Daily wear or
up to 6 nights extended wear
Daily wear or
up to 30 days extended wear
Available Sphere Powers +6.00D to -8.00D
(in 0.25 steps)
-8.50D to -10.00D
(in 0.5 steps)
-12.00D to +8.00D
(in 0.5 steps after +-6.00D)
Available Base Curves 8.6mm 8.6mm
Available Diameters 14.2mm 14.0mm
Technical Parameters
FDA Group V V
Lens Material Silicone hydrogel
(Lotrafilcon B)
Silicone hydrogel
(Comfilcon A)
Lens Type Aspherical Aspherical
Wetting Agent Yes
- PVP
- PEG
None
% of Material 67% 52%
% of Water 33% 48%
Center Thickness 0.08mm 0.08mm
Oxygen Transmission 138 Dk/t 160 Dk/t
Modulus 1.0 MPa 0.75 MPa
Other Features
Special Features TriComfort™ Technology
High wettability through low contact angle.
Permanent plasma treatment for a smooth surface
Aquaform® Technology
UV Blocking Unknown No
Dynamic Light Absorption No No
Visibility Tint Yes
(blue)
Yes
(Sofblue®)
Inside-out Mark No No
Packaging, Pricing and Ratings
Packaging Details 6 lenses per box,
each lens in a
foil-sealed plastic package
6 lenses per box,
immersed in buffered 0.83% saline
Price Range $30 - $50 $35 - $50
Cost per Day $0.17 - $0.28 $0.19 - $0.28
Consumer Rating ( 1367 Votes ) ( 1439 Votes )
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Conclusion:

Biofinity covers a wider range of available powers than the Air Optix Aqua. Both lenses are available as toric as well as multifocal lenses.