I agree with Buffalobob. I've spent a lot of time assessing glare performance of scopes at the last few SHOT Shows. The ceiling lighting in the big halls is nearly ideal for this. I've noticed that glare performance tends to degrade as the magnification increases, it also tends to get worse at all magnifications as the mag range increases. That is, a 3-10X scope will have less glare at 10X than a 6.5-20X scope at 10X.
Extra engineering and cost to reduce glare is one of the things you pay for with very good optical scopes like Zeiss, Swarovski, etc. In the mid-price range, not all scopes are created equal, either.
While a long sunshade can limit field of view for a low mag scope, it won't for a high mag scope, which is where it's needed most. IMHO, If you can use a sunshade, then do so.