I have never used a cat sitter, but I have used automatic feeders over a weekend, and although they are not cheap, they can of course be used over and over again
I use these
https://www.amazon.co.uk/Cat-Mate-C20-A ... 503&sr=8-7 as I find the mechanism idiot proof - I have two of them so that provides 4 meals, and dry food can be left out as well
I would prefer someone I and my cat knows to come in, but would worry about a stranger frightening the cat, and leaving doors open, and I also think, probably wrongly, that it might be a bit cruel to have someone enterering and my cat thinking it's me and being upset when it isn't
left entirely alone they do tend to hunker down and sit it out without being traumatized