Even with only a few ice seasons under my belt, i'd disagree with the above recommendations about a flasher over a digital display. This is an agree to disagree conversation as there's thousands of these discussions online.
I've had zero lag issues in the cold temps and i went out in ridiculous temps last year. Even though LCD has the word "liquid" in it, it's not going to freeze but slow down because it inherits the states of both a liquid and solid due to it's composition being in the middle of those two states. An ipod left in your car overnight will lag initially until it warms up but then is perfectly fine. If you're going to be standing outside without a heated shelter for the entire day in -30C then "maybe" that's a different discussion, but even then i'd be hard pressed to believe it'll lag as it's still working and generates heat which will keep those components sufficiently warm.
The battery on my Lowrance was solid and easily stretched over a few days of heavy use without requiring a charge.
I can't bring myself to stare at those flashing lights on a flasher. Again, personal preference.
This is pretty much what every conversation of flasher vs non-flasher looks like lol. I'd suggest look at them on the ice in person.. fish with people and see how they behave and go after what you think you'd want. Looking at the chase/streak of the fishing coming up on my digital display is amazing and for that alone flashers aren't my thing.
