Yes, a flat or square tail is likely the better choice for your style. Flat tails provide maximum edge hold and power through the end of your turns, which means more confident carving on hardpack and better energy transfer when you're linking turns down groomers. The tail acts like an anchor, keeping your ski engaged until you're ready to release into the next turn.
Twin tips sacrifice some of that tail grip because the upward curve reduces the effective edge contact. If you're not landing switch or hitting park features, you're giving up performance for a capability you won't use.
Flat tails are the standard for racing, frontside carving, and freeride skiing where edge hold really matters. Some freeride skis use a slight tail rise as a compromise, but if pure carving performance is your priority, a traditional flat tail is hard to beat.