Depends on your space, how your going to transport it, how many times your going to use it etc etc.
I had a 3m sib which i used to leave inflated over the summer in the garage and lifted onto my roofrack and launched from the beach when used. Delfated and packed away over winter.
Mate had one and due to space always deflated after use.
Just make sure if you do delfate that you pump the compartments up as suggested in the destructions, ie a little in each first, gradually building up, not each one up to 100% then the next etc etc.
Clean, dry, rolled up, on a shelf in the garage works for me. Some people prefer to keep them inflated or partially inflated, which is OK if you have space. Try to keep it away from any vermin that might chew holes in it!
If you can, inflated, we had a PVC Quicksilver we used a a tender, we used to blow it up when we needed it then roll it up afterwards, wasn't long before it needed a couple of patched where it had creased in the same place time after time and damaged the fabric, I expect Hyperlon would be more forgiving.
