Here's a comparison chart with more detailed specs:
Comparison_HELIX_LT.pdf
Helix LT
Dual DSP-HX Modeling
6.2" 800x480 Pixel LCD Screen
62 Amps, 37 Cabs, 16 Mics, and 104 Effects
Capacitive Footswitches
Up to 2 Expression Pedals
External Amp switching
Midi Control
20.87 x 11.93 x 3.66 inches
12.5 lbs
Helix Floor
Dual DSP-HX Modeling
6.2" 800x480 Pixel LCD Screen
62 Amps, 37 Cabs, 16 Mics, and 104 Effects
Capacitive Footswitches
Customizable Scribble Strips
Up to 3 Expression Pedals
CV/Expression output
External Amp switching
Midi Control
22.05 x 11.85 x 3.58 inches
14.7 lbs.
Helix LT vs Helix Floor I/O
LT is missing the SPDF I/O, XLR input, EXP 3 jack, AUX in, Send/Return 3 and 4. Also, the Helix LT does not have a separate headphone volume knob. The headphone output is shared with the main volume knob.
Helix LT View Screens
Since the Helix LT does not have Scribble strips, you can hit the View button the access the "Stomp View" on the main screen. The colored blocks correspond to the footswitches below to easily show what's active in your signal chain.
Here's preset view
