Think about what will be most functional for you. We also struggled with the couch decision, and looked for a couple of months until we fully decided.
If you get a loveseat and sofa, the sofa will have to go along the wall by the window. Most sofas are too large to place perpendicular to the window wall, and will cut off your entry from the kitchen (or your sofa and loveseat will overlap each other near the wall... and you don't want that either). The love seat will have to be placed there instead. Consider where you will be placing your TV. Will it be against the wall or in the corner? Which couch will you prefer to sit in when watching TV/have the better viewing angle?
We prefer to usually sit on a larger couch, mainly because we like to snooze
. We went with a sectional so that either way you sit, the couch is large enough to spread out. For others, this wouldn't even been an issue.. it's all personal preference, so consider what your preferences are.
You've been in my house
, but incase you forget, here's what our set-up looks like: