I agree with @Edwin--in short, "find" is more welcoming and friendly.
In all honesty, "We hope that you will consider the school welcoming..." seems a bit aggressive and, in some cases, may imply that there is some unspoken penalty if they do not consider your school to fit those criteria. I'll compare it to a mob boss blackmailing a detective: "We hope you'll consider us to be law-abiding citizens." (That's an exaggerated comparison, of course, but I only brought it up to clarify how it can be perceived as slightly hostile and/or defensive).
"Find", on the other hand, is more subtle and considerate. It emphasizes their natural discovery of those qualities in the school's environment without any sort of coercion, bribery, or outside influence.