Cost will depend where you live. In Australia you may as well sell your car regardless of which you go for.
It also depends if you're skirmishing, or back dropping the castle.
A lot of people have a problem with the H&A/Vatican castle being underscale. I love the castle, I own a ridiculous amount of it, but it does have limitations specifically relating to the tower footprint size. You may get 2x based figures in it, unbased probably 3-4, check the pics. The remainder of the sizing doesn't bother me at all. The catwalk is wide enough for a 40x40 base comfortably. They also make different breached sections. It's light foam, prime coated in grey, and is easy to get on the table with a basic paint job and looks sweet. There are also many wall variations with attached buildings, so it just doesn't look plain either. I use this for Helms' Deep. The limitations may or may not be an issue depending on how you intend to play with it.
The Grand Manor castle is *I think* the old Ian Weekley castle. Again I own a ridiculous amount of it which surprised Ian back then when he cast it for me in the 90's. My edition of it suffers from excess grease from mould release that I have never cleared up, and some very muddy detail. I would fully expect the grease to be an issue from that time and the rush casting, and not an ongoing issue for you to be concerned about. I gave up on painting it, which will be obvious from the pics. I found the detailing very muddy in parts and tough for my poor skills to cope with reasonably. The gate is very blobby for wall texture, as are random parts on walls and towers. The keep not pictured is a lovely big thing suitable for it's job with a huge flat top that can take a few catapults. You should check with someone who knows the current product as to how clean the surface texture is. Have a look at the natural yellow resin wall in the pic for the general muddyness, on the opposite of the wall it gets worse. I use it for a Gondor castle.
Figures are Copplestone normans and Blacktree crusaders. Siege tower by GW for reference.