are progressive knockouts harder to solve than normal mtts? is zoom a better game than normal tables? harder to cheat on zoom and math changes with bountys in place.

Every additional variable makes solving a game more difficult.

Not sure how you would actually quantity “better” in a non-subjective manner for Zoom vs. regular tables and also not sure what makes Zoom tables harder to cheat on per se.

I think PKO MTTs are the most complicated format currently widely available, and are the most resistant to bots, player assistance tools, and solvers.

Zoom games have advantages and disadvantages for players. The main advantage is speed (so you can play more volume in shorter time periods) and the main disadvantage is that bb/100 winrates are typically lower than can be gained on regular tables.
It's also harder for collusion to happen on Zoom tables (for obvious reasons), but it's not completely impossible. (Indeed, in small player pools, collusion is almost certainly happening).

how about PKO turbo STTs 9 max? and how about the hyper sngs with 36 players pkos?

9-man KOs are quite easy to beat at the $1-3 BI levels because there's enough room for postflop play, while the opponents tend to be weaker than in a non-KO 9-man. $5s seem a bit hard to beat for a higher hourly winrate than $3s because of the higher number of regs per table.

36-mans are hard to beat because of the 12% rake and the short duration (8 hands and 4 minutes on average per player because the majority of them bust in the 1st hand; the blinds double up every 2 minutes). An inaccuracy in the ranges (especially in the first hand) can lead to a loss of a few % from the ROI, and every % is important. Let alone that nerves of steel are necessary to withstand the swings of these games where the blind growth is explosive and ranges tend to be very wide. The only upside is that, if you somehow manage to beat them, then your hourly winrate will be amazing because it's possible to play 60-100 games an hour.

Note that neither of these KOs are progressive; the bounty amounts are fixed and hence matter more in the early phase.

I wasn't aware that there is such a thing as a progressive KO format for 1 table tourneys.
In MTTs, it's the progressive nature of bounties (meaning that different players have different bounties) that makes them so complicated.
It's possible for someone in a PKO MTT to have a very high bounty on them, while also being short-stacked (after getting crippled), and it's also possible for a player to go very deep in a PKO MTT without winning many bounties. That doesn't happen in a single-table KO game.