I can't say which is the "best" build. I've tried both in CB and OB, and they each have their own advantages/disadvantages. Depends on what you prefer.
Obviously when I had more STR, I was able to smack things and kill things a lot faster - which lets me solo a bit better than my current END/SPR cleric (I have 25 SPR and is now pumping END). END/SPR gives me a better crit rate - but a rate is a rate, I don't constantly do it (although I crit more often in OB.. I think) - but I love SPR too because I get more SP. True, there is that Divinity skill, but how often do we get it? Not very. How much SP does it at? Not a whole heap. I still get the skill, of course, but the extra SP from the SPR stat makes me happy. I remember my SP stones usage rate was a lot faster in CB because I had less SP. Having more SP now lets me go for slightly longer grinding sessions without having to go back to get more stones, but then I don't think the difference is too great anyway.
About whether you should use mace/hammers - I'm not going to comment because I switch all the time. I use whatever I get for free/cheaply because... I'm just too poor. xD I don't get the mace/hammer masteries though. They're expensive and I don't think they're all that good either. Might as well save my money for something else.
As for skill empowerments, besides the 10 points for heal, I've also chucked another 5 points into increasing duration time of Invincible. After putting 5 points into it, your invincible becomes .. 15.5 seconds I think. You might think "psht, 7 seconds, with a 2 minute cooldown, what difference does that make?" Well, let me tell you, it's damn useful. I spam invincible a lot whenever I can now, and let's just say that it saved me and my partys' asses heaps of time. Being able to buy 7 more seconds to revive someone/heal myself/heal someone else/finishing killing the mob is awesome. Of course, this is a personal preference. I haven't added anything else yet, I'm saving up my skill points for... no idea, maybe rejuvenate, but I'll see.
If you don't like the idea of increasing duration of invincible, then don't put any points in it at all. It's a waste if you only put like 2 or 3 points and then leave it - it's good to either max it out or not max it at all. I always like the idea of chucking 5 points into one thing to max it all out instead of chucking 2 or 3 points here and there.
I've also heard that putting 5 points into enhancing bash is good. I haven't done this myself because I'm planning to be more of a support cleric rather than a battle cleric, so I'm saving my points for support skills. But if you're the type that likes to go up and whack everything, then putting 5 points in bash would be your choice as it's our only attack skill until level 40 (then we have trip/bleed which I haven't got... because if I switch weapons, I can't use the other, so no comment on those).
And I don't know much about rings... I don't know much about armour/weapons/accessories someone else can comment on that. I only wear rings I get from quests or I pick up, never buy them. xD I'll wear anything that has STR/END/SPR I guess (preferabbly END/SPR since that's my build... if you have STR/END build then STR/END ring I guess? -shrugs-).
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