What is the best sticker pack? (Personal Preference)

This was how I would plan my sticker purchases as of today:

1. Buy the 40k coin pack that gives you a character upon purchase. Keep getting those packs until you find a character you feel you'll feel comfortable with early in the game. Once you buy about 10 of the 40k packs and you don't feel like any character you received fits you, stop buying the 40k packs. Now that a large amount of character stickers are gone, you'll have a much better chance at getting the characters you actually want from the cheaper packs rather than random character stickers that you don't need.
2. Buying the 20k Supremium pack was my next go to pack after the 40k pack. You'll be using both plants and zombies in this game so using a pack that benefits both sides at the same time is important. However, if there's a particular character related sticker in one side that you really want, by all means, use the pack that benefits that side only.
3. After getting every character sticker and upgrade sticker in the 20k Supremium pack, move onto getting Zomboss Down character/upgrade stickers from the 30k Zomboss Down pack.
4. (Optional) Get all the Zomboss Down accessories before moving onto the next pack.
5. Start obtaining 30k Legends of the Lawn packs for the character/upgrade stickers.
6. (Optional) Get all the Legends of the Lawn accessories before moving onto the next pack.
7. After buying the Supremium, Zomboss Down, and Legends of the Lawn, you should've obtained a good amount of skip stars. You are also probably at the 100s or 200s at this point, meaning you have challenges that need to be skipped because of how time consuming they're. In order to get more in the cheapest way possible, you must buy either the 10k pack or the 20k packs depending on which is more "lucky" to you. I felt that I tend to get 6-8 stars from a 20k pack and only 1-3 stars every 10k pack. However, some claim that 10k packs are better so it really just comes down to personal preference.
8. After getting a sufficient amount of skip stars, start buying the 5k packs to get most of the accessories.
9. After getting a sufficient amount of skip stars, start buying the 40k Bling packs to get the rest of the accessories.

If you are at step 8 or 9 and you have a low amount of skip stars, go back and repeat step 7 until you are comfortable with the amount of skip stars you have then move onto step 8 & 9 again.