Looking for dual channel no frills distortion. Any recommendations?

Electro Harmonix Hot Wax is exactly what I use for these applications. One side for slight breakup, the other for heavy distortion.

Affordable, too. However, it does have some "frills" in the form of a clean blend, seperate volume pots, and a very basic 2-band EQ section.

 

Source Audio Aftershock is right up your street. 6 user selectable patches from a vast array of differetn distortions / Overdrives / Fuzzes. Spend a bit of time with the Desktop UI and you can configure each patch to use Bass / treble controls on the device. Super easy dial in and very versatile.

 

The stock presets are generally good enough. I only use the editor to change things about and set things up. Once done, I hardly use the editor at all. There are hundeds of community patches of different dirt models available, it can be fun strolling through them all and trying them out. There's a fair amount of extra features for you to play with under the hood, but it's not necssesary.
Some of the more complicated pedals from Source Audio can be quite complex to use. However, their Modulators Dirt and compressor pedals are really easy to use live. 4 knobs and a 3 way switch (to access the 6 patches) is all the control they need.
For my 6 patches, I generally have overdrive, Muff, Gated Muff (patches 1-3 in the green zone) and Dual stacked Overdrive, Animato clone, Prunes and Custard clone (patches 4-6 on the red zone). With Gain, Grit, Bass & Treble controlls assigned to each patch.

 

You have a 3 way toggle switch and an ALT button on the top, giving you 6 presets to choose from.
I found it a bit too much to use the button on the SA pedals, but three presets is plenty!


Jam Pedals also has you covered:
Lucydreamer Bass: It is an Overdrive that delivers quite a lot of gain when you dime it.
Rattler Bass: Based on the RAT, it is a Distortion - for when the Lucydreamer does not provide enough.
Red Muck Bass: One step further, this is fuzz territory.

(all these are available for guitar, too - make sure to get the bass pedals).

 

I agree with @el murdoque . If you just need a simple distortion with 2 gain levels, the Jam bass pedals are a great choice. All 3 of them have a boost foot switch for higher gain (amount adjustable with internal trim pot).

 

There's a 3 way switch, one for each patch. Push and hold the main stomp button and the Big LED turns red and the switch then controls the other bank of three. It's really easy.

 

Fuzzrocious Demon with second drive mod. You get a master volume, tone, and two independent drive knobs that you can switch between.

 

Might be able to score an old Bass Drive for cheap.

 

Same as the new boss.