^ This. Also, if you're really worried about the budget but still want to be safe, just be careful with how you tighten the thing onto your 90D. I've seen some folks over-torque third-party grips and actually crack the plastic frame... total nightmare during a wedding. Honestly, if you're going for the Vello BG-C10 Battery Grip for Canon 70D 80D 90D, it's a pretty solid middle ground, but make sure you're using legit batteries. I've seen people blame the grip when it was actually some cheap knock-off battery failing inside. Ngl, I'd suggest picking up a spare Canon LP-E6NH Rechargeable Lithium-Ion Battery regardless of which grip you choose. It's better to have the official power cells even in a cheaper shell. Just watch out for that mounting wheel tho... it can get loose after a few hours of heavy shooting and that's usually when the connection drops. Just give it a quick snug check every time you swap cards or whatever.

Late to the party but check the specs! The Canon BG-E14 Battery Grip for EOS 90D is the only one with legit weather sealing. If youre in Seattle rain, those gold-plated contacts are amazing!

• Canon BG-E14 Battery Grip for EOS 90D: Zero shutter lag and perfect weather-sealed fit.
• Vello BG-C10 Battery Grip for Canon 70D 80D 90D: Solid budget pick but lacks gasket seals. Go OEM, the voltage regulation is way more stable and you wont risk a short!

Honestly, weddings are high stakes and Seattle weather can be a real pain if it starts drizzling. In my experience, you dont want to be fiddling with a loose connection when the couple is walking down the aisle. Ive tried many third-party grips over the years to save a few bucks, but I usually regret it for professional gigs. The Neewer Vertical Battery Grip for Canon 90D is fine for casual shooting, but the plastic feels thin and the dial sometimes skips.

• Get the Canon BG-E14 Battery Grip for EOS 70D 80D 90D for the wedding. It has the same weather sealing as your body and the shutter button feels identical.
• If you must go cheaper, the Vello BG-C10 Battery Grip for Canon EOS 70D 80D 90D is a bit better than Neewer but still wont feel as snug. Tbh, saving $90 isnt worth the heart attack of your camera rebooting during the vows. Just bite the bullet on the official one and your hands will thank you.

I totally get the hand cramp struggle! If you want to save money but still get pro results, you gotta check out the Meike MK-70D Professional Battery Grip for Canon 70D 80D 90D. It is fantastic because:

• It uses high-grade copper for the contact points which prevents that annoying low battery error you get with cheaper clones.
• The rubberized grip matches the 90D texture perfectly so it feels like one solid unit in your hand!
• It has a super satisfying shutter button click that isnt mushy at all. Seattle weddings are the best! I was just there last summer and the coffee culture is literally insane. I think I spent half my budget at small local roasters near Capitol Hill before I even got to the venue. The moody clouds make for such epic lighting tho. Anyway... but yeah, the Meike is definitely a sleeper hit for the 90D.

Following this thread

Seconded!