I personally hate those staged photos, I've a sil who adores them, tbh it's like keeping up with the kardashians photo shoots, you know, everyone dressed same, very staged poses, heads in hands, just all fake looking and kids look ridiculous as they're dressed in something they would never wear, doing stuff they'd never do.
I've had great photos when mine were small, very natural, some came with big suitcases full off fun things, like bubbles, puppets, squeaky toys and loads more, they had an assistant who would use these toys to entertain the kids, make them laugh, keep them occupied and interested because everyone knows when a kid goes to these photo shoots they suddenly want to cry, crawl/run off.
Definitely look into the voucher, we learned the hard way on our first that it doesn't usually cover the cost of all the photos and when you're presented with what photos they've taken you feel guilty not choosing them all or they're too nice not to get and ends up costing a fortune.
Photographers usually have a 'style' and if staged is their thing then maybe use the voucher for a group Christmas photo of you all and arrange something with the photographer you prefer. You can probably look up their work and see what exactly they do. One thing for sure, if you really want photos done, get them done they way you like, these photos usually end up on display forever, no point having ones where you're all lying on the floor in denim and white, head in hands gazing into the air.