Check this:
Why choose the DLT-19 over the RT-97C?, Reddit - Battlefront subreddit
I think it's right to say that RT-97C is more powerful and has tighter
spread (starting and maximum). In theory it will drop a DLT-19 user if
both go at each other from 10 m. However, it's looks more like a
burst-fire weapon at medium range. It gets less accurate quicker than
DLT-19 per shot, but it stabilises quicker too. Has minimal side to
side and bigger upwards kick than DLT-19.
DLT-19 looks like the more 'spray and pray' weapon of the two (there's
just no real penalty from holding down the trigger), with slower
spread build up and less of a upward kick, thus feels more predictable
and reliable. RT-97C has a bit more damage (1 'blast' less on average,
assuming you stay on target) meaning you can come up victorious in CQC
if you learn to control it and it offers great accuracy as long as you
keep tap-firing it.
I've got the RT-97C yesterday and I'm sort of getting the hang of it.
As long as I manage to control I can win with DLT-19 users in 1 v 1
and drop targets that I would find difficult with DLT-19 at longer
range. However, one small mistake and you will easily miss a 'blast'
or two that wouldn't happen with the DLT-19. It's definitely good and
if you're willing to master it you will give you a slight edge over
DLT-19.
Great statistic to remember:
Base spread
DLT-19 - 0.5
RT-97C - 0.1
With spread per shot:
DLT-19 - 0.025
RT-97C - 0.15
So RT-97C has amazing accuracy with the first few shots, but after
that it can easily get more inaccurate, but will not go over 1.0
(which it will reach after 6 hots). DLT-19 will go to a maximum of
1.475 without start cards (max is 2.0, but it goes up by 0.975 after 39 shots before overheating from the base of 0.5), meaning that
overall RT-97C should be considered more accurate, but it increases
the spread much faster.
I own the game but I really don't play that much, but I can say that the RT-97C is better than the DLT-19 in terms of rapid fire when shooting.
But DLT-19 is a good starter blaster.