Some of these answers are really interesting...
I added a new round and also some more suggestions from people, keep them coming...
Also I figured I should answer them as well now xD
ROUND ONE
1. Night Glider or Munchy - Night Glider
2. Mimic or Bright Eyes TE - Hard one but Mimic.
3. Christmas G3 Minty or G3 Target Snowflake - Snowflake, no contest.
4. G4 Feathermay or Honeybuzz - Another hard one, probably just Feathermay but it'd be tough.
5. G2 Water Lily or G2 Copper Glow - Also difficult, I'm going to go with Copper Glow.
6. Baby Gusty or Baby Ribbon (play and care, not BBE) - Baby Gusty
7. Rapunzel or Sweet Scoops - Sweet Scoops
8. Fizzy or Wind Whistler (SS) - Fizzy. The best WW to me is a Movie Star
9. Princess Pristina or Blueberry Baskets - Pristina. Princesses > Scent
10. Red Roses or Starglow (any version) - This one is harder. Probably Red Roses unless it was my coral Starglow, who might tempt me the other way.
ROUND TWO (Suggestions from Otocolobus_manul, tailrustedtealeaf and Ponyfan)
11. Diamond Dreams or Lemon Treats? - Lemon Treats.
12. pure white Taffy or pure white Quackers? - Taffy. MUCH harder to find.
13. TAF Buttons or MGR Sparkler? - Buttons
14. G2 Study and Play or Nosy and Click? - I had to ask google which was which, but Nosy and Click.
15. G3 Bay Breeze or Rosey Posey? - Bay Breeze
16 G4 prototype Minty A or prototype Sweetie Blue? - Minty
17. Watercolor Misty or Pearly Tiny Bubbles - Tiny Bubbles, because UK.
18. Pajama Case Plush Cotton Candy or Bowtie? - Bow Tie
19. Plush Baby Lofty or Baby Lickety Split? - Lofty
20. Cuteasaurus or ChaCha (Llama)? - This one is tough. I'll go with Cutesy.
I'm gonna add a Round Three as well!
21. G4 Holly Dash or Haven Bay? - Haven Bay is way harder for me to get, so Haven Bay.
22. Sunburst or Tornado? - Sunburst!
23. Tux & Tails or Satin & Lace (any version)? Satin & Lace (Magenta)
24. Rattles and Tattles (newborn) or Sandcastle and Shovels? - Sandcastle and Shovels, just.
25. G4 Starswirl or G4 Rainbow Flash? - Starswirl
26. Waterfall with Cascade or Kitchen Playset? - Waterfall. It has a pony, and she's awesome.
27. Peppermint Crunch or Raspberry Jam? - Raspberry Jam.
28. G3 SLH Rarity or SLH Sunny Salsa? - Sunny Salsa
29. G2 Miss Painter or Hip Holly? - Miss Painter
30. Clover or Patch? - Clover. I never liked Patch much.
Bonus from Ponybookworm:
3 foot Frilly Frocks or 3 foot Star Shimmer? - Frilly.