I use lightshot and have good ad-blockers so it’s all good for me;
yeah but the thing is you're showing it to everyone else
If sharex gets images of higher quality or has some gif-making capability I might switch
if you set it to save as png then it's literally pixel for pixel identical to what you see on your screen
and yes it can record gifs (as well as mp4s)
also for the record, sharex is not exactly 1:1 with the other software you list. sharex isn't a host. it's just a screenshot tool. you can choose to upload it to whatever host you want. it includes a few by default (of note is imgur, which u should use)
along with some other uploaders for text and files