How much weight will you carry, how many people? How wide is your hangar door? How tall is the hangar door?
500- Lots of fun to fly. Need wide hangar door. Friends won't like the back seats, small kids won't mind. Make sure it has a C20. You can get a 500 in smaller landing spots than the 206. Low exhaust compared to the 206 is something to think about landing in tall dry grass in the mountains.
206- More like a family car, but still fun to fly. Needs a tall hangar door- but can be much narrower than for the 500. More comfortable back seats and room for 3. Will be limited on fuel and pax starting at your field elevation in the summer. More baggage room for fishing tackle, hunting/camping equipment and picnic baskets in the 206.