Looks like a good choice. Below is a short list of spec comparisons between the Sony HDR-CX440 and the Canon VIXIA HF R600
Sensor Size:
HDR-CX440 - 1/5.8"
VIXIA HF R600 - 1/4.85"
The Canon will probably have better low-light performance due to the larger sensor size.
Effective Pixels:
HDR-CX440 - Effective Picture Resolution : Approx. 2290K pixels (16:9) / Approx. 1710K pixels (4:3)
VIXIA HF R600 - 2,073,600 pixels (Video), 2,073,600 (Photo)
Maximum Aperture:
HDR-CX440 - F1.8-F4.0
VIXIA HF R600 - f/ 1.8 - f/ 4.5
Optical Zoom:
HDR-CX440 - 30X
VIXIA HF R600 - 32X
Video Resolution:
HDR-CX440
Video Resolution : HD:1920x1080/60p (PS), 60i (FX,FH), 1440x1080/60i (HQ,LP); MP4: 1280x720 30p; XAVC S HD: 1920x1080/60p, 30p
•Movie Recording Rate(Average Bit Rate/VBR) : HD PS:Approx.28Mbps / FX:Approx.24Mbps / FH:Approx.17Mbps / HQ:Approx.9Mbps / LP:Approx.5Mbps; MP4: Approx.3Mbps; XAVC S HD: Approx.50Mbps
VIXIA HF R600
High Definition
AVCHD Progressive
1920 x 1080p / 60 fps (28 Mbps)
1920 x 1080i / 60 fps (17 Mbps)
1920 x 1080p / 30 fps (24 Mbps)
High Definition
AVCHD Progressive
1440 x 1080p / 60 fps (5 Mbps)
High Definition
MP4
1920 x 1080p / 60 fps (35 Mbps)
1920 x 1080p / 30 fps (24 Mbps)
1920 x 1080p / 24 fps (17 Mbps)
High Definition
MP4
1280 x 720p (4 Mbps)
Focal distance (length):
HDR-CX440 - f= 1.9-57.0mm (3/32 - 2 1/4 inch)
VIXIA HF R600 - 2.8 - 89.6 mm (7/64 - 3 27/64 inch)
Wi-Fi:
HDR-CX440 - Yes
VIXIA HF R600 - No
Headphone and Microphone jacks:
HDR-CX440 - Not listed in specs
VIXIA HF R600 - Yes
Minimum Illumination:
HDR-CX440 - Standard: 6 lux (1/30 Shutter Speed); Low Lux: 3 lux (1/30 Shutter Speed)
VIXIA HF R600 - 5 (NTSC) .4 (Low Light Mode)
If you want live streaming without the purchase of optional/additional equipment then go with the Sony HDR-CX440. If low-light performance and headphone/microphone jacks are important then go with the Canon VIXIA HF R600. There is not much difference in the Optical Zoom. Ultimately it comes down to which features are the most important to you.