I’d also have to say the PIAT, Followed by the Panzerfaust, PanzerShrek and finally Bazooka.
Why the PIAT:
1.) Cheap to make
2.) Effective charge
3.) Not a rocket
- Can be fired from inside an enclosed space (aka a building)
- No smoke trail
4.) Re-Cocks itself after each shot (only needs to be cocked once)
Why the Panzerfaust was next.
1.) Cheap
2.) Effective
3.) Disposable
4.) Simple to Use
Why the Panzershrek was next
1.) Very Effective
2.) Long Range
Why the Bazooka was Last.
1.) Rounds too small to hurt german armour to the front armour.
- Note the original design caused for a rocket the same size as the Panzershrek, but the war dept scaled it down to make it cheaper and lighter, one more great invention whittled down to second rate (then ripped off by the germans and done right)