You have to stay current and what ever you fly will help , this will show if you get invited to do a sim check.
I had not flown a big aircraft for about 4 months when I did the BAe 146 course as had the rest of the guys on the course but i had been flying an extra 300 , about as far removed from the 146 as you could get but it kept my hand flying sharp.
Flying time is never wasted as long as you learn something and keep in practice.