I installed both the OEM 5th wheel and gooseneck systems in my 2014 RAM. I would say without a doubt they are worth it.
Since you said short bed I think your best option is to definitely get the 5th wheel prep. The short bed may require you to use a slider hitch which will necessitate the pucks on each corner. You can get a gooseneck version of the B&W companion slider hitch but that requires a B&W gooseneck receiver. With all that said, I think the 4-puck 5th wheel system gives you the greatest # of hitch options. There is a version of the B&W that works with the puck system along with several other hitch brands.
Do you foresee the possibility of pulling a gooseneck? If so, then get that too. And definitely get the in-bed wiring. If you're ordering a truck these options don't cost all that much.
KJ
'14 Ram 2500|Crew Cab Long Bed|4X4|Cummins
Curt Q20 with Ram 5th Wheel Prep
2000 Crownline 205BR
1997 Ranger Comanche 461VS
'01 Polaris Virage TX PWC
'94 Polaris SLT750 PWC
3 Wonderful Sons (21, 15, & 13)
1 forgiving wife!!!