Not sure which on to purchase. Just need a little direction.
Should I assume the higher the model number the newer the product. Thanks
Cisco Catalyst 3750 Series WS-C3750G-24T-S 24-Port Layer 3 Gigabit Switch
Cisco Catalyst 4948 WS-C4948-S 48 Port L3 Gigabit Switch
in general, the higher the number, the greater the switching capacity, and the more features the switch has. You need to evaluate what you need the switch for, and what features you need (e.g. how many users do you have, what apps do they run, etc.).
The Cisco Switch Selector is a good start: