Hopefully, the flight school has both and you are able to utilize both. Till steam is totally gone from the commercial side, not saying GA, then regular familiarity would be beneficial to a lower hour gal/guy.
And I can't totally agree on glass making your lazy. I've been training in a G1000 as well as few a/c with steam gauges and Garmin 430's and 650's. Yeah, the HSI/CDI isn't slaved but doesn't make it anything more or less than glass at that point... IMO of course. Hell, the school I am at currently is upgrading to Garmin G5's which is half steam/half glass. Embrace both.. if you want harder flying go buy a straight VFR aircraft with basic gauges and do your E6B time distance heading routine with wind correction. An hour flight takes you just the same amount of time to plan, and that's assuming the forecast was half correct when you are in the planning phase. I'm not bashing that type of flying, and actually totally respect it as someone who started with steam, an VOR receiver, and a half operational ADF.