Battery questions

Well it looks like it's time to replace my battery. I haven't pursued the problem yet but it turns over really slow in the morning but does fine throughout the day. Doesn't seem to hold a charge.
Anyway assuming it is the battery, is there any reason to go to a gel battery for a daily driver or should I stick with a traditional battery? Also, with a gel battery don't you have to change the tray out?
Thanks,
Jim '84 Targa