Hi davymole.
I have recently purchased a hw 40 and I think it is a fantastic pistol ideal for target shooting as it is light and well balanced and is easy to cock, which might be important to you as you said you have a disability.
The alecto in my experience is also a nice pistol. It is light and accurate with three power settings.(the wh40 has only one). It is quite large and bulkey and I found it difficult to cock in the higher power setting as I have problems with an old shoulder injury.
Some gunshops may allow you to try before you buy. So you could compare the two and see which would be the most suitable for you.
I hope htat I have been some help to you. Good luck with whatever pistol you choose.