If you don't mind every day injections I would use the suspension with dbol.
Primo is junk these days, even if you do find the real thing it's expensive. I'm just flat out not a fan of deca and I wouldn't use parabolin (tren) without using test.
If your biggest fear is losing your gains then you need to invest time (and money) into your post cycle therapy. Perhaps look into HCG if you've had problems in the past maintaining gains from cycles. Or stick with clomid/nolva type therapy.