Replacing Roof Top A/C units

We're doing a major renovation of our 10 year old National MH this year, (roof work, slide seals and paint) and I'm thinking about replacing both Duo-Therm A/C units only because they are 10 years old. Both still work fine but as any electro-mechanical devices exposed to the elements, they have a limited lifetime and repairs/replacements on the road are generally more expensive.

I may even replace one 10k BTU unit with a larger (15K BTU) one.

Are there better units available?...better brands, newer technology?

I'd like to be able to use the same controller which also controls the furnaces etc.