You want your business cards to make an impression. They should have a creative design that makes your business stand out. There are a number of styles of creative business cards, that range the gamut from expressive to more minimal design. Your business card should match the brand of your business and be creatively aligned with your goals.
A business card is a physical object that a potential prospect leaves the encounter with. Your brand stays with them. If you meet a prospect and exchange email addresses and phone numbers you each walk away with another contact on your mobile phone -- it ends there. If you hand over a creative business card that makes a great impression that person is likely to show it to other people -- putting you and your brand in front of additional prospects.
And how do your current business card designs look, is their design still current, or are they starting to look dated? Would you feel excited and proud handing them to a new lead? You want your cards to come across as vibrant, modern, and fresh. They need to represent your brand and business, carry the personality and message of your company, and encourage prospects to connect with you.
Two individuals with their heads buried in their phones typing away woould not create any kind of significant memory of the encounter. You can easily transfer the information from a business card to your mobile device after the conversation.