BR700G clicking (on?) during lightning storm but other UPS aren't?

[Anonymous user]

I own three APC UPS, they are as follows: 

1.BGE70

2.BE550G

3.BR700G

Last night I had a lightning storm and and as I lay in bed I saw lightning strike outside and then immediately heard the BR700G audibly click and the LCD screen turn on and report an "event". I saw the lightning flash multiple times and heard it click directly thereafter each time. Each posted as an event. 

Weird thing is, I did not hear the other UPS(s) click and the the BE550G did not report an event through powerchute. 

Does the BR700G offer more protection or is it more sensitive? I was glad to have it protecting my more expensive electronics and was validated in using it for my more expensive stuff. 

If the BR700G is of higher quality I will only be buying those or better from now on. Is this true? 

On another note, I have an inverter generator that puts out a pure sine wave. That will work in conjunction with these UPS(s) right? 

Thanks! 

- BTW you need to fix this forum, its in a novice state.