I won't try to suggest a brand, but will offer the following suggested criteria:

• proper gearing for climbing
• a triple crank will likely give you the best hill climbing gearing
• tires with a light tread will work better than a heavy or knobby tread for your stated riding purposes
• the lighter the bike the easier (in most cases) it is to climb a hill
• make sure that the bike fits
  • It will be more comfortable and more efficient
• a non suspension fork will be much lighter and much more efficient, particularly on smooth roads and hills
  • a suspension fork can add +/-3 lbs
  • a suspension fork saps energy particularly when climbing

Good luck and be well.