It depends on how risky you want to be, and whether or not you use Guthans. The spinolyps magic attacks hit you harder than the range one, since you're wearing Veracs/Guthans. But with Guthans healing you, you could heal all the damage dealt to you off the spins, and not need to use prayer at all, and stay a very long time. With Verac's, you have a higher prayer bonus, and it's a little less risky/more straightforward. Pray mage the whole time, brewing and restoring whenever your health gets too low.