These three tend to arrive together, for a simple reason: they are all functions of when a community was built.
Trees take decades. Lot sizes have shrunk steadily as land costs rose. Bungalows were the dominant form in the 1950s and 60s and largely stopped being built later. So a community developed between roughly the 1950s and the 1970s tends to offer all three, and a community developed in the last twenty years generally offers none of them.
Which means the search for "mature trees and a big lot" is really a search for a particular era — and it comes with that era's houses, which will be smaller, need updating, and have older mechanical systems.
Starting points rather than a ranking — every one of these contains variety, and there are exceptions in both directions:
Browse Calgary bungalows for sale or homes with larger yards.
Harder, because they are not built at scale any more — a bungalow uses more lot for the same floor area, which is expensive land use. Where they do appear:
If single-level living is the actual requirement — rather than the bungalow style itself — villas widen the search considerably. Condo, villa or bungalow →
An established community gives you trees, lot and location. It also gives you a house that will need work — and possibly Poly-B, aluminum wiring or an older electrical panel depending on the exact era.
That is a completely reasonable trade. It is simply worth going in with the budget for it rather than discovering it in year two.