Hi Gurus and budding musicians alike

With MCO looming, I'm looking to improve my gears and I'm looking for something to enhance the sound of my acoustic guitar, a Takamine G Series electro acoustic with TP-4T pickups
Mostly used for worship sessions. Intermediate level.

What pedal would you guys recommend for a first?

Some of the pedals I have narrow'ed down.

1) BOSS AD-2
2) NUX Optima Air
3) Fender Preverb

Also Saw some Youtubers saying they won't leave their guitars without an Octave Pedal OC-3 or OC-5 but it hardly blend with the sound I want to produce.

Any other recommendations from other manufacturers? Want to emphasis on Preamp and Reverb

Bonus Question : Anyone here using delay effects with their acoustic?

If plugged in to my Bullet amp, I'm using delay+chorus. Just playing in house, not on stage or anything.