Not Apple/MAC, but if Apple vs PC isn't important:
If it is important, then disregard.
I like my Lenovo Thinkpad
It's pretty lightweight, small (small notebook/netbook size), and memory maxed out, so it handles what you're looking for, and then some (it'll run statistics processing software SPSS well, although not as quickly as if it had mainframe or giant desktop resources). I've not had this computer bog down, no matter what I've asked it to do. The only limitations I've found in this area are related to internet subscription/speed, which have nothing to do with the computer, itself.
The Lenovo I have is made for commercial/business use, so not as lightweight as brands/models marketed to consumers, but the components are far more robust and far less likely to fail. The keyboard is good-sized with back-lit keys and the screen has all sorts of adjustments, so customizable for what's comfortable for individuals. It's easy and fast for me to adjust for different lighting, as well.
I bought used from a reputable, local brick-and-mortar place that refurbishes trade-ins from businesses since I didn't need bleeding edge technology, and saved $$$
Here's a brief article that
summarizes the differences between business and consumer laptops
Business vs. Consumer Laptops: What You Need to Know
Should you buy a business laptop or a consumer laptop? Here's how to choose the right laptop for your organization's needs.
www.businessnewsdaily.com