They are both called "tumbler dryers". You don't need an outside vent with a condenser dryer, unfortunately they take much longer to dry the clothes. I don't think that the boxes which collect water will be much better.
You won't be using any dryer all of the time. Is it possible to move it when you want to use it and put the vent pipe through an open window? You are right, the dryer in Argos is not a condenser and the vent kit would need an outside wall.
Condenser dryers are a pain, I've got one. How about having an outlet for a vented dryer in an outside wall and an extended venting kit. OK the vent kit might be inconvenient, however after the laundry is dried the venting kit would fold into the drying drum.
Another thought, you bathroom will probably be nearer to your bedroom and most clothes eventually end up their. Have you enough space in your bathroom for a tumbler dryer? More.
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