I have (or have had) all of these and they're all great choices. Schlimii can be a little finicky for some people to grow, but I wouldn't call it difficult. The Carol Kanzer has an excellent quality flower. Much darker petals than most and a lovely inflated pouch.
Interestingly enough, all of these have potential for fragrance (albeit lightly so). Schlimii should be fairly fragrant, a trait which it imparts into some of its hybrids. My Carol Kanzer wasn't fragrant, but some of them are. One of the parents of Druid Spring is primulinum, which is a fragrant species. It's also hit or miss as to whether that fragrance carries over to its hybrids. My DS is very slightly fragrant, but many are not.
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