As far as originality, Megaguirus rules over the others. As far as entertainment, I like Tokyo SOS the most. But I still say Tezuka is pretty unimaginitive in his execution. All 3 of his films are almost exactly the same in many ways, much like the latter day Hesei films. Just unoriginal. He had a stroke of genius with Kiryu's backstory of being the original Godzilla and having the DNA computers, and having random outbursts. But these strokes of brilliance were made so small that they seemed pointless in the grand scheme of things.
Kaiju Transmissions Podcast-
If It Bleeds, We Can Kill It Podcast