One of the best advantages of a pelican 1510 is that you can stand it on one end and sit on it! Can be a consideration if you attend events where a seat would be helpful to shoot from. Having waterproofing for outdoor events sounds like a pretty smart justification too.
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Will a 1510 fit a backpack bag? Kind of beat worlds if you need to lock it to something and be portable.
Google 'RucPac Hardcase Backpack Conversion' - Converts most wheeled hardcases into a backpack.
I have an SKB case. I love it, except for the weight. Hard cases are always heavier. The biggest advantage is how much easier they are to secure. I can padlock and cable lock it during events which is nice.
I have a pelican one and while I like it I have ended up using my lowepro backpack way more often. My main problem is just that I find it annoying to carry instead of just wearing the pack. It does sound like it would work well for you though.
Depending on the sports. Most of the time I do use my pelican but if I have to cross lots of grass then one my backpack bags is the choice. I also change out my bag depending on the event and body/lens needs.
Check out the Apache 5800 from harbor freight. Then get the pelican insert for the same size case. It’s a great solution. I use nothing but hard cases and have at least 6 different sizes depending on job.
I looked at the Apache cases but decided against them because of the lower water proof rating, and I also watched some reviews comparing the major hard case brands, and the Apache would always perform the worst. The Nanuk wasn’t significantly more expensive, so I decided to get it.