What scope for a .22LR rifle? A few questions....

Like the title says. I have a basic blued/wood Marlin Model 60 that needs a new scope. I currently have an NC Star 3-9x40 mil-dot on it and it's so mediocre that it's almost unusable. Looking to keep it under $150. So no S&B or US Optics.

I use this rifle for practicing the fundamentals of shooting for groups on a budget (not necessarily plinking per se), and want to be able to hit small targets out to 150 yards max. How important is AO/adjustable parallax? And tell me about factory-set parallax and how it affects scope performance for surgical shots from 10-150 yards.

I'm considering the Bushnell 2-7x32mm AR Optics Drop Zone-22 BDC scope as an option so far. I was also interested in the Vortex Crossfire II 2-7x32mm Dead-Hold BDC scope for similar price but the specs say parallax is factory-set at 100 yards, should that be a deal-breaker? I'm not an expert on scopes.

Whatever I choose, I'm set on having a mil-dot or BDC reticle to use the different aiming points for holdovers depending on the distance to target.

Thanks in advance for answers.

That Nikon looks pretty nice too, I'll have to add it to the list. I have a Sportsman's Warehouse local to me that I can go to to look for these scope and see if I can get some hands-on before ordering sight unseen.