On paper both offer 330-350 mm class volumes. In practice the H2D is three machines in one: a dual-nozzle engineering printer, a LiDAR-calibrated production tool, and optionally a 10W/40W laser platform. The A2L is one machine done cheaply and well: big, open, PLA/PETG-focused.
Buy the A2L if the question is 'how do I print big things without spending four figures'. Buy the H2D if dual materials, soluble supports, engineering filaments or the laser are concrete workflow needs.