I would go for the hardtail every time. Although i do have one of each, i do find for a lot of the time the hardtail is more than adequate, but it does depend on what you are doing.
I did a full season of enduros last year on a hardtail and to get a bit of squish i used a Cane Creek Thudbuster and cant recommend them enough. They take a little getting used to but once you do they are great. They really take the discomfort out and allow you to sit down more, almost the best of both worlds.
I am never gonna say it will be as good as full suspension, but for a compromise, it doesn’t get any better.