Thought the name was familiar!
Personally i like nitro alot more than electric. dont get me wrong electric has its place, just that place isn't on my shelf in most cases.
but looking at a few aspects, HPI is very well known, so parts are out there more often, and higher quality (could be debated i guess).
they did stick with the sprint for awhile so id have to say goes to show the car works well.
i would probably focus most funds to the electric one being that it will probably last longer, and have longer lasting replacement parts.
and then eventually get another nitro when a good deal pops up. the RS4's are good lol.
P.S.
that is all MY thought process lol, we all think differently and have different directions we want to go, so please just take that as my $0.02