Spikes are like saddles... very personal. The saddle and gaff combo I feel most comfortable in/with may totally NOT work for someone else.
That said, if you're inexperienced on gaffs at all, it makes the recommendation even harder, and makes most people hesitant to say anything at all besides HIRE A PRO. We have plenty of people making in into the injuries/fatalities section already.
If you must, try Buckinghams, 3-1/2" gaffs. Leather T-pads are basic, but the velcro-wraps are alot more comfy. Tall boots help alot- I use 12" Wolvie steel shanks on hooks.
I hope you're only spiking a tree to remove it??
Climb safe.