I have a Renegade Spirit (the side feed) as well as the Iwata Eclipse.
I did not care for the Spirit in stock form. The large, gravity style side cup I found to be ridiculous. It threw the brushes balance way off to one side, and not being able to remove a cup with paint in it kinda undermines the idea of having a removable cup to begin with. I also did not care for the size... seems unnecessarily heavy to me. Now, I rectified all these personal preference issues and turned my Spirit into a brush I like using. I made an adaptor to use more normal color cups - both Aztek and Iwata, on the brush. I also use a Sotar handle on the brush which alters the balance, and shortens the OAL. Lastly, I altered the air valve retainer, and spring to soften up the trigger feel, making the brush feel more responsive.
So, with all of that customization - I can tell you that the Spirit is a brush I almost never use. On the other hand, an Iwata Eclipse HP-BS is a brush I could use on a daily basis. I just adore the performance is provides, with a minimum of fuss. Now, I know some will say, well it is because it is an Iwata, etc... but, you get to know me a little better and you will see that brand has little to do with anything for me. I care about how they work. I have enough variety to reach for anything I want each day, and I tend to stick with the ones that perform the way I want a brush to perform - mostly, I could care less about brand.
Breaking it down into category, the Iwata is simply a better build than the Badger. Machining tolerances, fit, finish - they all go to the Eclipse. Trigger feel and function, the Eclipse. Atomization - Eclipse... you get the idea.
Now, in stock trim - you may find it easier to pull a fine line with the Renegade, but the quality of the lines once you get to a size that is compatible between them (and they are fine) will go to the Eclipse. The Badger offers the ability to choose between three nozzle/needle sizes on the brush, the Eclipse only 2. With that said, the stock .35 Eclipse will allow just about the same range of spray pattern as the three different Badger set ups combined. While I do have the CS, I choose the BS more often, simply because it matches my use better. I seldom need that much paint in a cup at one time... I also have the SBS, but that is another story
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I should also add here - while I do prefer the Eclipse, the Renegade is also a very nice brush. They are normally less expensive than the Iwata brushes, and when on sale can be had for very reasonable prices. The Sotar style head/nozzle will produce some very nice work. If you were leaning toward Badger because you like the brand, you will most likely be cool with your decision to purchase one.
That's my .02 on the subject