Put me in the "big deep slide is better" category.
DH won't consider anything without a slide. We like to have our grown children visit and we need the room inside to cook, eat and play in - especially when it rains. Our current trailer is a Wildwood 26TBSS that has a very big slide. Note that slides come in different sizes (both width and depth).
We had one trailer with no slide, it was like living in a hallway. You can't get to the bathroom if someone is cooking as they blocked the way.
If you have 2 or more people, slides become more important.
You do need to consider how functional the trailer is without the slides out. For example, can you load the fridge with the slide in? Can you get to the bathroom with the slide in?
I can use my fridge with the slide in which is great for stopping for groceries on way to campsite. But I can't use the bathroom with the slide in - so I open the slide if I need to use the bathroom.
Ed