Hi there and welcome!
I spent a while researching different platforms and I'm glad I decided on Square for now. I needed a way to send recurring invoices, and the website/appointments feature was an interesting plus for me.
I actually started using the website by just testing it out. It is user-friendly. It took me some time to get used to how it's all organized, and what the different sections mean, but there are lots of simple tutorials and helpful pop-ups and forum posts to get me to the point I needed to get to. Took me about a week, an hour (give-or take) per day to feel like I had a handle on things.
There are a fair amount of customization options, including SEO features. You can transfer your domain to Square and have them take care of the hosting, so all-in-one, if you'd like.
I've run into some support issues but was able to get them resolved decently quickly. I've used the support articles, online chat, the forum, emails, and the phone... nothing off-putting or abnormal about the customer service. It's all been quite pleasant, in my case.
Trying out the free version would probably give you a good sense if it would be a fit for you or not. Best of luck!
