I find color preference to be idiosyncratic, what I love may be meh for you, but as a general rule, I have yet to meet a Stila e/s that wasn't at least moderately pigmented (almost all are true to pan, what you see is what you get) very smooth buttery texture and easy to blend. I find almost any of their palettes to be very utilitarian, if the color scheme appeals to you, you will love it. So, while I can't recommend a specific palette because you would need to pick the colors you find work for you, I would say everyone should try a palette, that is what Stila does very, very well. I have not tried the huge palettes that look like color wheels, but if I ever find one at a discount, I will snap it up and I may even get one full price.
I have the Blanc and Noir palettes and they are great for travel, the shades are quite versatile.
I have never tried the convertible lip colors, I may do that soon.
I hate the clicky lip gloss pen thingies. Just not for me.
The smudge pots are definitely comparable to fluidlines, great gel liners that set with great staying power and no smudging at all for me, no flaking or fading. Color stays true to the one you see in the pot.