We had very limited space for a washer and dryer so we chose a stackable dryer that didn't need outside venting.  This model met our limitations.  It's capacity is adequate  and with so many settings it can accommodate different kinds of loads.  It does take considerably longer to dry some items and that's a bit disappointing but to be expected not having a outside vent.
If you do several loads of laundry a week or do larger and heavier items I think a larger dryer that's vented outside would be a better choice.  This serves our purpose though.