Best Aa Shield from pets

[Irreflexivo]

What shield is better from the following pets and why?
-Nekro
-Glowstick
-H Cottonkill / H Oswald

If there is a better one please tell me:)
I'm just starting and I keep dying in hard maps hehe I'd like to have some sort of resistance.
Thank you for reading

[cheap merch]

Nekro is way better than any other pet