I prefer the larger size bottles for the workshop but I keep a small bottle of medium strength loctite like this in my kit bag at work for the odd occasion where it is required and I'm not near the workshop.
The medium strength is about as strong as you would want to go for a lot of DIY applications and is easily removed with hand tools. The high strength stuff usually needs to be heated to remove it so if you are wondering what to go with I'd generally go with the medium strength stuff. If you needed anything stronger you'd normally know.
This 2400 Loctite is differentiated from their 243 (also medium strength) as it doesn't carry any warning symbols and doesn't contain various nasties. Probably not something that would concern people too much but useful to know for anybody looking at both and wanting to know what the difference is as it isn't always clear.