The Blizzard 1260's SCSI hostadapter is nice & fast. In case of compatability problems, you can easily switch off the B1260 by pressing the '2' key. And, also nice, if you have the optional Blizzard SCSI hostadapter, you can add a second 128 MB simm. IIRC, the Apollo won't go above 64 MB.
All in all, the Apollo is slightly cheaper, the Blizzard is better designed. Oh, and Cyberpatcher is very nice to have (and it comes only with the B1260).