To me when I build RGT I want my Reasonings to resolve evenly so I opt for more variations in my monster star levels
The artwork for the latter, an enormous tree-beast, certainly looks like it could be the ultimate, melded form of the character, and we can't think of many other good reasons there'd be two legendary creatures for the same person
On eye appeal alone, both the Charizard V Ultra Rare and Full Art offer a buffet of beautiful colors and details to appreciate
Use the PSA Population Report for graded copies
Note that you can discard Constellar Zubeneschamali with Nachsters 2nd effect then Special Summon it with Nachsters 3rd effect
The card would probably be broken otherwise, so that is a nice tradeoff, plus it makes Skarmory ex more viable with the added reduction