The A1 handles the overwhelming majority of home printing: PLA/PETG, multicolor via AMS lite, 256 mm parts, at the lowest serious price in the market. The H2D is Bambu's flagship for dual-material engineering work with a build volume of 350 x 320 x 325 mm and optional 10W/40W laser.
The instructive gap: five A1s cost less than one H2D. Unless dual extrusion, engineering materials or the laser are concrete needs, the A1 answer wins on every practical metric.