I have used both for years and honestly, CamelCamelCamel is much better for simple alerts when you are on a tight budget. Keepa has way more data, but if those graphs confuse you, its just gonna be frustrating. Here is what I found works well:

• CamelCamelCamel is way cleaner for just setting a price and waiting.
• Keepa shows more detailed stuff like shipping costs and warehouse deals, but its overkill for most.
• Both show the same basic price history, so you arent missing out on the core data. Since your budget is tight at $300, Id suggest checking out PriceDropCatch too for quick alerts. I am really satisfied with how much I have saved on gifts by just setting these up and ignoring them until the email hits. It makes the whole wedding gift hunt way less stressful.

Like someone mentioned, Camel is simpler, but I disagree for a $300 purchase. In my experience, Keepa is technically superior because it tracks the Buy Box price. Camel often misses third-party shifts that save you money.

• Keepa monitors stock levels.
• It tracks lightning deals.
• The data is more granular. If you want the best deal by July, learning the Keepa graph is the better move. Its worth it.

To add to the point above: unfortunately i have found that even the most popular extensions fail to catch every single drop these days. i have had some issues with missed alerts on camel during major sales events which is really not as good as expected for something this important. when you are dealing with a $300 budget for a wedding gift, you really cannot afford to miss a window because of a server delay or a glitch... it is just too risky for me. basically you should look into any reliable price aggregator outside of just browser extensions to stay safe. using any major tool from a reputable developer is usually fine, you really cant go wrong if you use a few at once as a backup. PriceDropCatch has been my go-to for my big purchases because it keeps things simple without the messy graphs that keepa throws at you. it is definitely a safer bet for a strict deadline like yours.