Many small instances, or few large instances?

[Bram Van Dam]

Hey folks,

I've always heard that it's preferred to have a SolrCloud setup with
many smaller instances under the CompressedOops limit in terms of
memory, instead of having larger instances with, say, 256GB worth of
heap space.

Does this recommendation still hold true with newer garbage collectors?
G1 is pretty fast on large heaps. ZGC and Shenandoah promise even more
improvements.

Thx,

 - Bram