I can only speak for me but I currently have two pistol red dot optics, a Holosun 507C with the ACSS reticle, which is a 100+ moa circle and an 8 moa chevron. The circle is huge so that when you present the optic and the chevron isn’t lined up, you can see the curve of the circle and you...
I’ve had both and neither is a great “do all” pistol. Get the Shield for now but get something larger with a rail for the house later. Think about something between those sizes as well.