When I compare the Tumi Latitude collection versus the RIMOWA Essential/Lite collections, I differentiate the three because of the two primary frame compositions:

Polypropylene versus Polycarbonate.

All are plastic-based materials, the base frame materials are inherently different.

Bottom line, you are in a three-way tie between the three brands; each product leading in, at least, one metric.

When comparing the Latitude International Carry-On and Essential/Lite Cabin-S, you get the following results:

Product / Dimensions / Capacity / Weight / Frame-Base Material / Price / Country of Manufacture
Latitude: 22 x 14 x 9 in / 35L / 6.24 lbs / Polypropylene / $750 / China
Essential: 21.7 x 15.8 x 7.9 in / 34L / 8.2 lbs / Polycarbonate / $670 / Czech Republic or Canada
Lite: 21.7 x 15.8 x 7.9 / 31L / 4.2 lbs / Polycarbonate / $540 / Czech Republic or Canada

When Tumi released the Latitude collection in 2018, the company touted the collection as their "lightest collection, to-date". IMO, Tumi created a product that met the needs of consumers wanting lightweight luggage and a plethora of in-house designed features (over 12+) for storage and utility.

The company chose their own trademarked brand of polypropylene-based resin, known as "SRPP (Self-Reinforced Poly-Propylene) Ballistic". Polypropylene (PP) is inherently weaker than polycarbonate. Characteristics include lower melt temperatures, heat deflection temperature, and tensile/flexural strength. PP has satisfactory chemical resistance to a wide array of bases and acids. To offset inherent weaknesses in the material, Tumi incorporated reinforcement rods into the frame of the cases, along with other enhancements, allowing the company to trademarks the SRPP Ballistic material.

RIMOWA, in 2000, was the first luggage manufacturer to introduce polycarbonate luggage with the Essential/Lite collections (previously Salsa/Salsa Air). IMO, RIMOWA created a collection for the traveller focused on lightweight base materials and the European aesthetic of minimalist contemporary design and appeal (think open spaces, clean lines, simple accents, etc).

RIMOWA chose a polycarbonate-based (PC) resin for their material of choice. Characteristics include higher melt temperatures, better head deflection temperature and tensile/flexural strength. PC has a high-impact resistance, compared to PP, but is more prone to scratching. This requires companies to add scratch-resistant coatings.

If you want proprietary in-house design and innovation, go with Tumi. If flexibility, in design and storage, with minimalism as the most evident feature, is your style aesthetic, go with RIMOWA Essential/Lite.

We could go on and on to more detail, but in the end, you have my summarized version.

Good luck and best wishes with your purchase decision.